mapping(string:string) friendly_values()
Returns tag values in a mapping. Only tag values that exists in ID3v1.1 is used. Nonexisting or undefined values will not appear in the mapping.
Takes its value from TPE1 or TP1 frames.
Takes its value from TALB or TAL frames.
Takes its value from TIT2 or TT2 frames.
Takes its value from TCON or TCM frames.
Takes its value from TYER or TYE frames.
Takes its value from TRCK or TRK frames. The string may be either in the "%d" form or in the "%d/%d" form.
"%d"
"%d/%d"