I like things that do not have specific high tones, that sound interesting, have female singers (because I like the sound, not because they're women) interesting sounds, overtones, happy, or just something I like. There's lots of stuff, and it changes, but right now I like the bird and the bee, metric, school of seven bells, fiona apple, kelly clarkson, and a bunch of other things.
I like songs that do not repeat the same thing many times at the end.
I like bands who are NOT reggae, ska, police, sting, clapton, nickelback, that guy from poison, freebird, the taking care of business song, smooth jazz, romantic R&B, too emotional, a bunch of other stuff, or annoying metal.
I also like stuff that is not a ballad by a metal or other hard kind of musicians, anything but those.