Apple iPods 101 - Manual (Page 52)

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 Grouping: This attribute is used when you want to
group more than one movement in a single classical
piece.
 Kind: The kind attribute is an audio file format. Some
of the current audio files that are supported include
AAC, AIFF, Apple Lossless, MPEG, and WAV.
 Last Played: Every time that you play a track, iTunes
will recored the time and date when it was played.
This way you can find out which songs you play more
than any others and add them to your Smart Playlist.
 My Rating: You can rate your music by giving it
anywhere from 0 to 5 stars in the iTunes library as
well as on your iPod.
 Play Count: This attribute will keep track of how
many times you play a specific song.
 Playlist: The playlist attribute will either exclude or
include tracks that are found in other playlists. You
can use this attribute for creating Smart Playlists that
are quite complex.
 Size: The size attribute lists the size of each track in
megabytes.
 Song Name: This one needs no explanation.
 Time: The time attribute keeps track of how long
each track is.