Acid punk
Acid rock
Action rock
Afro-punk
Alternative metal
Alternative rock
Anatolian rock
Arena rock
Artcore
Art rock
Avant-garde metal
Avant-rock
Avant-progressive rock
Baroque pop
Beat
Bisrock
Black metal
Blackened death metal
Blues-rock
Brazilian rock
British Invasion
Britpop
Bubblegum pop
Boogaloo
C86
Canterbury sound
Cello rock
Celtic metal
Celtic punk
Celtic rock
Chicano rock
Chimp rock
Christcore
Christian rock
Christian metal
Classic rock
Classic metal
Cock rock
Coldwave (France)
Coldwave (USA)
Comedy rock
Compressive Rock
Country rock
Cowpunk
Cuddlecore
Dance-punk
Dance-rock
Dark cabaret
Dark metal
Darkwave
Deathcore
Deathgrind
Death metal
Death rock
Detroit rock
Doom metal
Dream Pop
Electro Punk
Electronic rock
Emo
Experimental rock
Fastcore
Folkcore
Folk-rock
Folk metal
Freakbeat
Funkcore
Funk rock
Funk metal
Gamecore
Garage rock
German rock
Ghetto Rock
Glam metal
Glam rock
Goregrind
Gothabilly
Gothic metal
Gothic rock
Grindcore
Groove metal
Group Sounds
Grunge
Grunge metal
Hatecore
Hard rock
Hardcore punk
Heartland rock
Heavy metal
Horror punk
Indie pop
Indie rock
Industrial rock
Industrial metal
Instrumental rock
Iranian rock
Japanese rock
J-ska
Jam rock
Jangle pop
Kaizerrock
Krautrock
Latin rock
Lovers rock
Manila sound
Mathcore
Math rock
Melodic black metal
Melodic death metal
Metalcore
Mod
Moshcore
Mesh
Neo-classical metal
Neo-folk
Neo-prog
Neo-psychedelia
New wave
NWOBHM
Noise pop
Noise rock
No wave
Nu metal
Oi!
Ostrock
Pagan rock
Piano rock
Pinoy rock
Pop rock
Porn rock
Post punk
Post-hardcore
Post-grunge
Post-metal
Post-rock
Power pop
Power metal
Power violence
Progressive metal
Progressive rock
Psychedelic rock
Psych-Folk
Psychobilly
Punk rock
Punkabilly
Punta rock
Queercore
Riot grrrl
Rockabilly
Rock en Español
Rock in Opposition (RIO)
Rock Opera
Rockoson
Rocksteady
Raga rock
Rapcore
Reggae rock
Russian rock
Sadcore
Samba-rock
Screamo
Shoegazing
Shock rock
Shred metal
Ska punk
Skate punk
Skate rock
Sleaze rock
Sludge metal
Soft rock
Soul rock
Southern rock
Space rock
Spazzcore
Speed metal
Speedrock
Stoner metal
Stoner rock
Sunshine pop
Surf rock
Swamp rock
Symphonic metal
Symphonic rock
Synth rock
Thrash metal
Thrashcore
Trash rock
Trip rock
Twee pop
Viking metal
Wagnerian rock
Wizard rock
Yacht rock
Zeuhl

soft rock, hard rock, progressive rock, heavy metal and punk rock.

pop/rock rock hard rock soft rock progressive rock heavy rock metal hair metal heavy metal clasical rock phycodellic hardcore death metal emo gothic rock alternative punk clasical free style blues southern rock black metal screamo numetal british steel glam rock grunge mainstream bower ballet gothic metal and industrial
and thats about it...

not in any real order.... Classic(Eric Clapton), Southern(Lynard Skynard), Numetal(Nickleback), Psycedelic(Pink Floyd), Pop Rock(Linkin Park), Punk(The Unseen), Metal(Black Label Society), Hardcore(Norma Jean), Deathmetal(Six Feet Under), Mainstream(My Chemical Romance), Hair(Poison), Power Ballet(Meat Loaf), Screamo(Hawthorne Heights), Emo(Oneline Overdrawing), Goth(HIM), Industrial(Rammstien) and then you have mixes of these... But that is most I can think of.

man...there are hundreds, two bands can have very little difference yet be classified as different genre's.
Metal all the way!

I was going to just type all of the ones I knew... and I actually started...

But this is a more effective way.

http://en.wikipedia.org/wiki/List_of_rock_genres