granted I am sure this will start a debate, but screw metallicas shady butts. They started off so good, record our shows, play for your friends, and where the first to jump on the lets sue napster band wagon. Can you say hypocrites anyone?(that being said normally i dont pay attention to the bs that surrounds bands/artist's and there personal life, but being how i used to listen to metallica, they totally lost my respect)
But onto the songs its hard to pink with all the favorite groups. So it really is dependent on mood.
classic rock aka pink floyd, aerosmith,ozzy/black sabbath
rap- various mainly southern artists/style a few "east coast" ones ying yang twins,paul wall,pitbull,sean paul,lil john,daddy yankee
alternative - bush, older green day before they went all cry cry political,beastie boys
classical- Goldberg variations, and of course the other greats Mozart,Beethoven etc
and absolutely NO COUNTRY! real life has enough problems i don't need to hear some poor yap singing about it strummin on a guitar.