<?php
$genres = id3_get_genre_list();
print_r($genres);
?>
The above example will output:
Array
(
[0] => Blues
[1] => Classic Rock
[2] => Country
[3] => Dance
[4] => Disco
[5] => Funk
[6] => Grunge
[7] => Hip-Hop
[8] => Jazz
[9] => Metal
[10] => New Age
[11] => Oldies
[12] => Other
[13] => Pop
[14] => R&B
[15] => Rap
[16] => Reggae
[17] => Rock
[18] => Techno
[19] => Industrial
[20] => Alternative
[21] => Ska
[22] => Death Metal
[23] => Pranks
[24] => Soundtrack
[25] => Euro-Techno
[26] => Ambient
[27] => Trip-Hop
[28] => Vocal
[29] => Jazz+Funk
[30] => Fusion
[31] => Trance
[32] => Classical
[33] => Instrumental
[34] => Acid
[35] => House
[36] => Game
[37] => Sound Clip
[38] => Gospel
[39] => Noise
[40] => Alternative Rock
[41] => Bass
[42] => Soul
[43] => Punk
[44] => Space
[45] => Meditative
[46] => Instrumental Pop
[47] => Instrumental Rock
[48] => Ethnic
[49] => Gothic
[50] => Darkwave
[51] => Techno-Industrial
[52] => Electronic
[53] => Pop-Folk
[54] => Eurodance
[55] => Dream
[56] => Southern Rock
[57] => Comedy
[58] => Cult
[59] => Gangsta
[60] => Top 40
[61] => Christian Rap
[62] => Pop/Funk
[63] => Jungle
[64] => Native US
[65] => Cabaret
[66] => New Wave
[67] => Psychadelic
[68] => Rave
[69] => Showtunes
[70] => Trailer
[71] => Lo-Fi
[72] => Tribal
[73] => Acid Punk
[74] => Acid Jazz
[75] => Polka
[76] => Retro
[77] => Musical
[78] => Rock & Roll
[79] => Hard Rock
[80] => Folk
[81] => Folk-Rock
[82] => National Folk
[83] => Swing
[84] => Fast Fusion
[85] => Bebob
[86] => Latin
[87] => Revival
[88] => Celtic
[89] => Bluegrass
[90] => Avantgarde
[91] => Gothic Rock
[92] => Progressive Rock
[93] => Psychedelic Rock
[94] => Symphonic Rock
[95] => Slow Rock
[96] => Big Band
[97] => Chorus
[98] => Easy Listening
[99] => Acoustic
[100] => Humour
[101] => Speech
[102] => Chanson
[103] => Opera
[104] => Chamber Music
[105] => Sonata
[106] => Symphony
[107] => Booty Bass
[108] => Primus
[109] => Porn Groove
[110] => Satire
[111] => Slow Jam
[112] => Club
[113] => Tango
[114] => Samba
[115] => Folklore
[116] => Ballad
[117] => Power Ballad
[118] => Rhytmic Soul
[119] => Freestyle
[120] => Duet
[121] => Punk Rock
[122] => Drum Solo
[123] => Acapella
[124] => Euro-House
[125] => Dance Hall
[126] => Goa
[127] => Drum & Bass
[128] => Club-House
[129] => Hardcore
[130] => Terror
[131] => Indie
[132] => BritPop
[133] => Negerpunk
[134] => Polsk Punk
[135] => Beat
[136] => Christian Gangsta
[137] => Heavy Metal
[138] => Black Metal
[139] => Crossover
[140] => Contemporary C
[141] => Christian Rock
[142] => Merengue
[143] => Salsa
[144] => Thrash Metal
[145] => Anime
[146] => JPop
[147] => SynthPop
)