it has to have some talent to it and not just a good voice, for me its mostly about the lyrics but usually great music is why i will first appreciate it. I HATE pop, and techno it's just the same shit over and over, i love alternative and acoustic music or bands
Depends on my mood.
I'll list in alphabetical order:
Alternative (the real kind not disguised Pop/Top 40 b.s.), real blues (delta and electric apparently, not country/western influenced), funk, grunge, hard rock, industrial, industrial rock/metal, Primus, psytrance (never knew that was what it was called lol)/trance, some progressive, some rap, reggae (in a certain condition), rock, space rock, psychedelic/acid rock, punk (anarcho, hardcore), metal and the following sub-genres: black, death, doom, funk, grindcore, progressive, sludge, stoner, thrash/speed).
I also don't go for pop or dance music (techno I can take if it's the extremely rave trippy kind without any singing usually whatsoever.)