Name of the album the track belongs to.
Album artist (compilation/various-artist albums use this in addition to artist).
Artist credited on the track.
Bit rate in kbps.
Beats per minute. Zero when unset.
Get the class (string) of a selected item.
Freeform user comment.
Whether the track belongs to a compilation album.
Composer credit.
Stable per-library database ID (distinct from Item.id).
Date the track was added to the library.
Long-form description (used by some podcasts / video).
Number of discs in the album set.
Disc number within the album set.
Length in seconds.
Whether the track is enabled for playback.
Episode identifier (podcast/TV show).
Episode number (podcast/TV show).
Stop offset in seconds (zero means play to the end).
Genre.
Grouping label.
Kind descriptor as displayed in Music.app (e.g. "Apple Lossless audio file").
Long description (typically used by podcasts).
Lyrics text.
Date the track was last modified.
Name of the item (song title, etc).
Number of times the track has been played.
Date the track was last played.
Track rating (0-100 in the AppleScript API).
Original release date.
Sample rate in Hz.
Season number (TV show).
Show name (TV show).
File size in bytes.
Number of times the track has been skipped.
Date the track was last skipped.
Sort key for the album (overrides default alphabetic sort).
Sort key for the album artist.
Sort key for the artist.
Sort key for the composer.
Sort key for the track name.
Sort key for the show.
Start offset in seconds.
Length formatted as a string (e.g. "3:45").
Number of tracks on the album.
Track number within the album.
true when the track has never been played.
Video kind for video tracks.
Per-track volume adjustment in the range -100..100.
Release year.
A track in an iTunes or Music library, derived from the Track Suite of the application's scripting dictionary. Subclassed by FileTrack (local files), AudioCDTrack (audio CDs), and URL tracks (remote streams).