It really depends on my mood and what I'm doing. Techno (progressive house, Digweed or Sasha mixes are always great), classic rock (Zepplin, Rolling Stones, Beatles, etc.), Punk (Sex Pistols, The Ramones, The Dickies, Blink-182), Songs from Hindi movies, classical (whatever is on the local classical station), bluegrass.
I generally prefer punk or techno for spirited driving, and a bit of whatever for cruising around. I have a mix of about 10 hours of my favorite songs on my phone that I stream for daily commuting - basically anything that plays is something I like that way.
