#EXIF type definition http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html
document
audioFile
Audio File
Audio Content (compressed or uncompressed)
    Artist
    Album
    Title
    Comment
    Genre
    Length
    Track
    Year
    Composer
    Disc Number
    Audio Format
    Sample Rate
    Audio Channel Type
    Number Channels
    Compressor Version