Album name.
Primary artist or performer.
Audio properties extracted from the stream, or null if the format does
not provide them or they were not requested.
Free-form comment.
Genre string (may be an ID3v1 genre name or a custom string).
Track title.
Track number within the album (0 if not set).
Release year (0 if not set).
Plain-object representation of audio file tags. All string fields default to an empty string, numeric fields default to
0.