@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
@C = Comment
@Z = Play Count
@R = Rating
@! = Current play state
@W = BPM
@Q = Album Artist
@O = Composer