ID3TAGのフォーマット

MP3ファイルの最後128バイトに以下のような形式で格納されています。
サイズはすべて固定長で、データの入っていない部分は0x00(Winampだと0x20) で埋められています。

ジャンルは、数値(1バイト)とジャンル名が単純に一対一で割り当てられています。 それぞれの対応については、下記のようになっています。
(ジャンルのデータが無い場合は、0xff。)

0x00	"Blues"
0x01	"ClassicRock"
0x02	"Country"
0x03	"Dance"
0x04	"Disco"
0x05	"Funk"
0x06	"Grunge"
0x07	"Hip-Hop"
0x08	"Jazz"
0x09	"Metal"
0x0a	"NewAge"
0x0b	"Oldies"
0x0c	"Other"
0x0d	"Pop"
0x0e	"R&B"
0x0f	"Rap"
0x10	"Reggae"
0x11	"Rock"
0x12	"Techno"
0x13	"Industrial"
0x14	"Alternative"
0x15	"Ska"
0x16	"DeathMetal"
0x17	"Pranks"
0x18	"Soundtrack"
0x19	"Euro-Techno"
0x1a	"Ambient"
0x1b	"Trip-Hop"
0x1c	"Vocal"
0x1d	"Jazz+Funk"
0x1e	"Fusion"
0x1f	"Trance"
0x20	"Classical"
0x21	"Instrumental"
0x22	"Acid"
0x23	"House"
0x24	"Game"
0x25	"SoundClip"
0x26	"Gospel"
0x27	"Noise"
0x28	"Alt.Rock"
0x29	"Bass"
0x2a	"Soul"
0x2b	"Punk"
0x2c	"Space"
0x2d	"Meditative"
0x2e	"InstrumentalPop"
0x2f	"InstrumentalRock"
0x30	"Ethnic"
0x31	"Gothic"
0x32	"Darkwave"
0x33	"Techno-Industrial"
0x34	"Electronic"
0x35	"Pop-Folk"
0x36	"Eurodance"
0x37	"Dream"
0x38	"SouthernRock"
0x39	"Comedy"
0x3a	"Cult"
0x3b	"Gangsta"
0x3c	"Top40"
0x3d	"ChristianRap"
0x3e	"Pop/Funk"
0x3f	"Jungle"
0x40	"NativeAmerican"
0x41	"Cabaret"
0x42	"NewWave"
0x43	"Psychadelic"
0x44	"Rave"
0x45	"Showtunes"
0x46	"Trailer"
0x47	"Lo-Fi"
0x48	"Tribal"
0x49	"AcidPunk"
0x4a	"AcidJazz"
0x4b	"Polka"
0x4c	"Retro"
0x4d	"Musical"
0x4e	"Rock&Roll"
0x4f	"HardRock"
0x50	"Folk"
0x51	"Folk/Rock"
0x52	"NationalFolk"
0x53	"Swing"
0x54	"Fusion"
0x55	"Bebob"
0x56	"Latin"
0x57	"Revival"
0x58	"Celtic"
0x59	"Bluegrass"
0x5a	"Avantgarde"
0x5b	"GothicRock"
0x5c	"ProgressiveRock"
0x5d	"PsychedelicRock"
0x5e	"SymphonicRock"
0x5f	"SlowRock"
0x60	"BigBand"
0x61	"Chorus"
0x62	"EasyListening"
0x63	"Acoustic"
0x64	"Humour"
0x65	"Speech"
0x66	"Chanson"
0x67	"Opera"
0x68	"ChamberMusic"
0x69	"Sonata"
0x6a	"Symphony"
0x6b	"BootyBass"
0x6c	"Primus"
0x6d	"PornGroove"
0x6e	"Satire"
0x6f	"SlowJam"
0x70	"Club"
0x71	"Tango"
0x72	"Samba"
0x73	"Folklore"
0x74	"Ballad"
0x75	"Power Ballad"
0x76	"Rhytmic Soul" 
0x77	"Freestyle" 
0x78	"Duet"
0x79	"Punk Rock"
0x7a	"Drum Solo"
0x7b	"Acapella"
0x7c	"Euro-House"
0x7d	"Dance Hall"
0x7e	"Goa"
0x7f	"Drum & Bass"
0x80	"Club-House"
0x81	"Hardcore"
0x82	"Terror"
0x83	"Indie"
0x84	"BritPop"
0x85	"Negerpunk"
0x86	"Polsk Punk"
0x87	"Beat"
0x88	"Christian Gangsta Rap"
0x89	"Heavy Metal"
0x8a	"Black Metal"
0x8b	"Crossover"
0x8c	"Contemporary Christian"
0x8d	"Christian Rock"
0x8e	"Merengue"
0x8f	"Salsa"
0x90	"Trash Metal"
0x91	"Anime"
0x92	"JPop"
0x93	"SynthPop"

RMPについて

RIFF-WAVEヘッダ付きMP3について