like some posters here, I agree that it is difficult to give one type of music. I like good music, depends on the mood, situation, environment, etc...
usual suspects:
*electronic/experimental/drum n bass/IDM
*jazz
*classical [anything with strings]
*singer/songwriter
*some folk
*some country [very little, Toby Keith, Alan Jackson, Big & Rich]
*alt. country [Ryan Adams, Wilco...]
*heavy rock [tool, deftones, slipknot]
*chill out rock [belle sebastian, sufjan stevens...]
*alternative
*underground rap [MF Doom, madvillain, Beans...]