Most of the id3 functions either let you specify or return a tag version. In order to specify the version please use on of these constants. ID3_V1_0 (integer) ID3_V1_0 is used if you are working with ID3 V1.0 tags. These tags may contain the fields title, artist, album, genre, year and comment. ID3_V1_1 (integer) ID3_V1_1 is used if you are working with ID3 V1.1 tags. These tags may all information contained in v1.0 tags plus the track number. ID3_V2_1 (integer) ID3_V2_1 is used if you are working with ID3 V2.1 tags. ID3_V2_2 (integer) ID3_V2_2 is used if you are working with ID3 V2.2 tags. ID3_V2_3 (integer) ID3_V2_3 is used if you are working with ID3 V2.3 tags. ID3_V2_4 (integer) ID3_V2_4 is used if you are working with ID3 V2.4 tags. ID3_BEST (integer) ID3_BEST is used if would like to let the id3 functions determine which tag version should be used.