In the mp3tager you can use the following genres:

Acapella          {Winamp 1.8}
Acid
Acid Jazz
Acid Punk
Acoustic          {Winamp 1.6}
Alternative
AlternRock
Ambient
Avantgarde        {Winamp 1.6}
Ballad            {Winamp 1.8}
Bass
Bedob             {Winamp 1.6}
Big Band          {Winamp 1.6}
Bluegrass         {Winamp 1.6}
Blues
Booty Bass        {Winamp 1.6}
Cabaret
Celtic            {Winamp 1.6}
Chamber Music     {Winamp 1.6}
Chanson           {Winamp 1.6}
Chorus            {Winamp 1.6}
Christian Rap
Classical
Classic Rock
Club              {Winamp 1.666}
Comedy
Country
Cult
Dance
Dance Hall        {Winamp 1.8}
Darkwave
Death Metal
Disco
Dream
Drum Solo         {Winamp 1.8}
Drum&Bass         {Winamp 1.81}
Duet              {Winamp 1.8}
Easy Listening    {Winamp 1.6}
Electronic
Ethnic
Eurodance
Euro-house        {Winamp 1.8}
Euro-techno
Folk              {Winamp 1.6}
Folk/Rock         {Winamp 1.6}
Folklore          {Winamp 1.666}
Funk
Fusion
Fusion#           {Winamp 1.6}
Freestyle         {Winamp 1.8}
Game
Gangsta
Grunge
Goa               {Winamp 1.81}
Gospel
Gothic
Gothic Rock       {Winamp 1.6}
Hard Rock
Hip-Hop
House
Humour            {Winamp 1.6}
Industrial
Instrumental
Instrumental Pop
Instrumental Rock
Jazz
Jazz+Funk
Jungle
Latin             {Winamp 1.6}
Lo-Fi
Meditative
Metal
Musical
National Folk     {Winamp 1.6}
Native American
New Age
New Wave
Noise
Oldies
Opera             {Winamp 1.6}
Other
Polka
Pop
Pop-Folk
Pop/Funk
Porn Groove       {Winamp 1.6}
Power Ballad      {Winamp 1.8}
Pranks
Primus            {Winamp 1.6}
Progressive Rock  {Winamp 1.6}
Psychadelic
Psychadelic Rock  {Winamp 1.6}
Punk
Punk Rock         {Winamp 1.8}
R&B
Rap
Rave
Reggae
Retro
Revival           {Winamp 1.6}
Rhytmic Soul      {Winamp 1.8}
Rock
Rock & Roll
Samba             {Winamp 1.666}
Satire            {Winamp 1.6}
Showtunes
Ska
Slow Jam          {Winamp 1.666}
Slow Rock         {Winamp 1.6}
Sonata            {Winamp 1.6}
Sound Clip
Soundtrack
Soul
Southern Rock
Space
Speech            {Winamp 1.6}
Swing             {Winamp 1.6}
Symphony          {Winamp 1.6}
Symphonic Rock    {Winamp 1.6}
Tango             {Winamp 1.666}
Techno
Techno-Industrial
Trailer
Trance
Tribal
Trip-Hop
Top 40
Vocal
Unknown!