@U - URL
@F - Filename
@X - File Type
@K - Kind
@S - Size
@A - Artist
@L - Album
@T - Title
@# - Track
@V - Disc Number
@G - Genre
@Y - Year
@I - Play Time
@i - Play Time (short form)
@D - Date Added
@E - File Creation Date
@P - Last Played Date
@B - Bitrate
@M - Sample Rate
@N - Channels
@H - Bits Per Sample
@C - Comment
@Z - Play Count
@R - Rating
@! - Play State
@W - BPM
@Q - Album Artist
@O - Composer