I mostly listen to J-Rock. Unlike many of the western bands, their alternative artists tend to have a more relaxing beat to them which you can listen to the melody instead of the screaming lyrics or the heavy distortion guitars. Though I only listen to three main artists usually, I'm looking at a few more.
Despite the above, I do listen to Linkin Park every once in awhile. Their two first albums (Hybrid Theory and Meteora) are pretty good while the Minutes to Midnight album is just a failure in my eyes.
Going on with that, I have started to pick up Zeth's taste in Sum 41. I heard their Underclass Hero wasn't as good as the original ones (which I am getting), but I found many of those songs enjoyable. I'm starting to get into others similar to these guys like (i.e. Blink 182)
In terms of classical music, I'm not much into true classical music. The closest I get to is Videogame OSTs. The closest I have would be the Final Fantasy VII collection and the Piano version of selected songs. Either way, Nobuo Uematsu is a musical genius.
And of course I listen to the classic rocks of way back in the day. I grew up listening to it and I still like it to this day.
I'm not much of the metal mix into my songs...I suppose the only artist I listen to in this sub-genre would be Metallica...sorry but this style just doesn't cut it forme.
I absolutely hate rap...it's a style for people to brag on what they have with the worst singing talents known to man. I'm indifferent to Country music (real country, not the pop/rock mixes today that suck); while I won't listen to it on my own, I don't care if I hear it.
In a sense, my music catagories are not very good to what they really are, but I don't care since it works for me.