diff --git a/beets/autotag/hooks.py b/beets/autotag/hooks.py
index 7cd215fc49..b809609ea4 100644
--- a/beets/autotag/hooks.py
+++ b/beets/autotag/hooks.py
@@ -16,236 +16,201 @@
 
 from __future__ import annotations
 
+from copy import deepcopy
 from typing import TYPE_CHECKING, Any, NamedTuple, TypeVar
 
-from beets import logging
+from typing_extensions import Self
 
 if TYPE_CHECKING:
     from beets.library import Item
 
     from .distance import Distance
 
-log = logging.getLogger("beets")
-
 V = TypeVar("V")
 
 
 # Classes used to represent candidate options.
 class AttrDict(dict[str, V]):
-    """A dictionary that supports attribute ("dot") access, so `d.field`
-    is equivalent to `d['field']`.
-    """
+    """Mapping enabling attribute-style access to stored metadata values."""
+
+    def copy(self) -> Self:
+        return deepcopy(self)
 
     def __getattr__(self, attr: str) -> V:
         if attr in self:
             return self[attr]
-        else:
-            raise AttributeError
 
-    def __setattr__(self, key: str, value: V):
+        raise AttributeError(
+            f"'{self.__class__.__name__}' object has no attribute '{attr}'"
+        )
+
+    def __setattr__(self, key: str, value: V) -> None:
         self.__setitem__(key, value)
 
-    def __hash__(self):
+    def __hash__(self) -> int:  # type: ignore[override]
         return id(self)
 
 
-class AlbumInfo(AttrDict[Any]):
-    """Describes a canonical release that may be used to match a release
-    in the library. Consists of these data members:
+class Info(AttrDict[Any]):
+    """Container for metadata about a musical entity."""
+
+    def __init__(
+        self,
+        album: str | None = None,
+        artist_credit: str | None = None,
+        artist_id: str | None = None,
+        artist: str | None = None,
+        artists_credit: list[str] | None = None,
+        artists_ids: list[str] | None = None,
+        artists: list[str] | None = None,
+        artist_sort: str | None = None,
+        artists_sort: list[str] | None = None,
+        data_source: str | None = None,
+        data_url: str | None = None,
+        genre: str | None = None,
+        media: str | None = None,
+        **kwargs,
+    ) -> None:
+        self.album = album
+        self.artist = artist
+        self.artist_credit = artist_credit
+        self.artist_id = artist_id
+        self.artists = artists or []
+        self.artists_credit = artists_credit or []
+        self.artists_ids = artists_ids or []
+        self.artist_sort = artist_sort
+        self.artists_sort = artists_sort or []
+        self.data_source = data_source
+        self.data_url = data_url
+        self.genre = genre
+        self.media = media
+        self.update(kwargs)
+
 
-    - ``album``: the release title
-    - ``album_id``: MusicBrainz ID; UUID fragment only
-    - ``artist``: name of the release's primary artist
-    - ``artist_id``
-    - ``tracks``: list of TrackInfo objects making up the release
+class AlbumInfo(Info):
+    """Metadata snapshot representing a single album candidate.
 
-    ``mediums`` along with the fields up through ``tracks`` are required.
-    The others are optional and may be None.
+    Aggregates track entries and album-wide context gathered from an external
+    provider. Used during matching to evaluate similarity against a group of
+    user items, and later to drive tagging decisions once selected.
     """
 
-    # TYPING: are all of these correct? I've assumed optional strings
     def __init__(
         self,
         tracks: list[TrackInfo],
-        album: str | None = None,
+        *,
         album_id: str | None = None,
-        artist: str | None = None,
-        artist_id: str | None = None,
-        artists: list[str] | None = None,
-        artists_ids: list[str] | None = None,
-        asin: str | None = None,
+        albumdisambig: str | None = None,
+        albumstatus: str | None = None,
         albumtype: str | None = None,
         albumtypes: list[str] | None = None,
-        va: bool = False,
-        year: int | None = None,
-        month: int | None = None,
+        asin: str | None = None,
+        barcode: str | None = None,
+        catalognum: str | None = None,
+        country: str | None = None,
         day: int | None = None,
+        discogs_albumid: str | None = None,
+        discogs_artistid: str | None = None,
+        discogs_labelid: str | None = None,
         label: str | None = None,
-        barcode: str | None = None,
+        language: str | None = None,
         mediums: int | None = None,
-        artist_sort: str | None = None,
-        artists_sort: list[str] | None = None,
-        releasegroup_id: str | None = None,
+        month: int | None = None,
+        original_day: int | None = None,
+        original_month: int | None = None,
+        original_year: int | None = None,
         release_group_title: str | None = None,
-        catalognum: str | None = None,
+        releasegroup_id: str | None = None,
+        releasegroupdisambig: str | None = None,
         script: str | None = None,
-        language: str | None = None,
-        country: str | None = None,
         style: str | None = None,
-        genre: str | None = None,
-        albumstatus: str | None = None,
-        media: str | None = None,
-        albumdisambig: str | None = None,
-        releasegroupdisambig: str | None = None,
-        artist_credit: str | None = None,
-        artists_credit: list[str] | None = None,
-        original_year: int | None = None,
-        original_month: int | None = None,
-        original_day: int | None = None,
-        data_source: str | None = None,
-        data_url: str | None = None,
-        discogs_albumid: str | None = None,
-        discogs_labelid: str | None = None,
-        discogs_artistid: str | None = None,
+        va: bool = False,
+        year: int | None = None,
         **kwargs,
-    ):
-        self.album = album
-        self.album_id = album_id
-        self.artist = artist
-        self.artist_id = artist_id
-        self.artists = artists or []
-        self.artists_ids = artists_ids or []
+    ) -> None:
         self.tracks = tracks
-        self.asin = asin
+        self.album_id = album_id
+        self.albumdisambig = albumdisambig
+        self.albumstatus = albumstatus
         self.albumtype = albumtype
         self.albumtypes = albumtypes or []
-        self.va = va
-        self.year = year
-        self.month = month
+        self.asin = asin
+        self.barcode = barcode
+        self.catalognum = catalognum
+        self.country = country
         self.day = day
+        self.discogs_albumid = discogs_albumid
+        self.discogs_artistid = discogs_artistid
+        self.discogs_labelid = discogs_labelid
         self.label = label
-        self.barcode = barcode
+        self.language = language
         self.mediums = mediums
-        self.artist_sort = artist_sort
-        self.artists_sort = artists_sort or []
-        self.releasegroup_id = releasegroup_id
+        self.month = month
+        self.original_day = original_day
+        self.original_month = original_month
+        self.original_year = original_year
         self.release_group_title = release_group_title
-        self.catalognum = catalognum
+        self.releasegroup_id = releasegroup_id
+        self.releasegroupdisambig = releasegroupdisambig
         self.script = script
-        self.language = language
-        self.country = country
         self.style = style
-        self.genre = genre
-        self.albumstatus = albumstatus
-        self.media = media
-        self.albumdisambig = albumdisambig
-        self.releasegroupdisambig = releasegroupdisambig
-        self.artist_credit = artist_credit
-        self.artists_credit = artists_credit or []
-        self.original_year = original_year
-        self.original_month = original_month
-        self.original_day = original_day
-        self.data_source = data_source
-        self.data_url = data_url
-        self.discogs_albumid = discogs_albumid
-        self.discogs_labelid = discogs_labelid
-        self.discogs_artistid = discogs_artistid
-        self.update(kwargs)
-
-    def copy(self) -> AlbumInfo:
-        dupe = AlbumInfo([])
-        dupe.update(self)
-        dupe.tracks = [track.copy() for track in self.tracks]
-        return dupe
-
+        self.va = va
+        self.year = year
+        super().__init__(**kwargs)
 
-class TrackInfo(AttrDict[Any]):
-    """Describes a canonical track present on a release. Appears as part
-    of an AlbumInfo's ``tracks`` list. Consists of these data members:
 
-    - ``title``: name of the track
-    - ``track_id``: MusicBrainz ID; UUID fragment only
+class TrackInfo(Info):
+    """Metadata snapshot for a single track candidate.
 
-    Only ``title`` and ``track_id`` are required. The rest of the fields
-    may be None. The indices ``index``, ``medium``, and ``medium_index``
-    are all 1-based.
+    Captures identifying details and creative credits used to compare against
+    a user's item. Instances often originate within an AlbumInfo but may also
+    stand alone for singleton matching.
     """
 
-    # TYPING: are all of these correct? I've assumed optional strings
     def __init__(
         self,
-        title: str | None = None,
-        track_id: str | None = None,
-        release_track_id: str | None = None,
-        artist: str | None = None,
-        artist_id: str | None = None,
-        artists: list[str] | None = None,
-        artists_ids: list[str] | None = None,
-        length: float | None = None,
+        *,
+        arranger: str | None = None,
+        bpm: str | None = None,
+        composer: str | None = None,
+        composer_sort: str | None = None,
+        disctitle: str | None = None,
         index: int | None = None,
+        initial_key: str | None = None,
+        length: float | None = None,
+        lyricist: str | None = None,
+        mb_workid: str | None = None,
         medium: int | None = None,
         medium_index: int | None = None,
         medium_total: int | None = None,
-        artist_sort: str | None = None,
-        artists_sort: list[str] | None = None,
-        disctitle: str | None = None,
-        artist_credit: str | None = None,
-        artists_credit: list[str] | None = None,
-        data_source: str | None = None,
-        data_url: str | None = None,
-        media: str | None = None,
-        lyricist: str | None = None,
-        composer: str | None = None,
-        composer_sort: str | None = None,
-        arranger: str | None = None,
+        release_track_id: str | None = None,
+        title: str | None = None,
         track_alt: str | None = None,
+        track_id: str | None = None,
         work: str | None = None,
-        mb_workid: str | None = None,
         work_disambig: str | None = None,
-        bpm: str | None = None,
-        initial_key: str | None = None,
-        genre: str | None = None,
-        album: str | None = None,
         **kwargs,
-    ):
-        self.title = title
-        self.track_id = track_id
-        self.release_track_id = release_track_id
-        self.artist = artist
-        self.artist_id = artist_id
-        self.artists = artists or []
-        self.artists_ids = artists_ids or []
-        self.length = length
+    ) -> None:
+        self.arranger = arranger
+        self.bpm = bpm
+        self.composer = composer
+        self.composer_sort = composer_sort
+        self.disctitle = disctitle
         self.index = index
-        self.media = media
+        self.initial_key = initial_key
+        self.length = length
+        self.lyricist = lyricist
+        self.mb_workid = mb_workid
         self.medium = medium
         self.medium_index = medium_index
         self.medium_total = medium_total
-        self.artist_sort = artist_sort
-        self.artists_sort = artists_sort or []
-        self.disctitle = disctitle
-        self.artist_credit = artist_credit
-        self.artists_credit = artists_credit or []
-        self.data_source = data_source
-        self.data_url = data_url
-        self.lyricist = lyricist
-        self.composer = composer
-        self.composer_sort = composer_sort
-        self.arranger = arranger
+        self.release_track_id = release_track_id
+        self.title = title
         self.track_alt = track_alt
+        self.track_id = track_id
         self.work = work
-        self.mb_workid = mb_workid
         self.work_disambig = work_disambig
-        self.bpm = bpm
-        self.initial_key = initial_key
-        self.genre = genre
-        self.album = album
-        self.update(kwargs)
-
-    def copy(self) -> TrackInfo:
-        dupe = TrackInfo()
-        dupe.update(self)
-        return dupe
+        super().__init__(**kwargs)
 
 
 # Structures that compose all the information for a candidate match.