It's really funny how my tastes have evolved over time. I don't really remember much about my tastes pre-ipod (12 or 13 I believe) except for one very special song that I remember listening to with a really close childhood friend who has since moved away and I don't see anymore. That song: "All the Small Things" by blink-182.
I think when I first got my iPod I listened to a bunch of rock; my uncle gave me his music collection which consisted of a lot of classic rock, with a few more recent things like Green Day. I remember liking the pop-rock (pop-punk? I suck at putting music into genres) shit like Simple Plan and Good Charlotte. From there I moved on to more modern rock; my freshman year of high school I went to a concert for Papa Roach, Buckcherry, and Hinder. I do remember Guitar Hero contributing a lot to my tastes. Some mid-high school loves: Linkin Park (who I still love their albums, even the later ones, but it seems like they're putting all their energy into a fucking MMO game?!), Rise Against (whose albums have become a lot more explicitly political which annoys the fuck out of me), Rage Against the Machine, and Three Days Grace.
I also started listening to alternative stuff. Weezer (skipped senior homecoming to go to a concert of theirs, as did many others from my school), Muse, Incubus, RHCP were a few that I really enjoyed. Gradually moved into more indie-ish stuff like Bon Iver, Mumford and Sons, Naked and Famous, Vampire Weekend, Arcade Fire, etc.
Right now I'm into listening to classical, though for the most part I couldn't name a song if I heard it. Listen to a fair amount of classic rock too (AC/DC, Guns n Roses, "Sultans of Swing" is my goddamn jam!), a fair amount of alternative/indie stuff (though largely I get new bands from the radio and I don't really listen to it this year), a teeny bit of hiphop/rap, and a few game/movie soundtracks. Oh, and also really big on 90's alternative/grunge/rock, which is sort of interesting in that I recognize almost all the songs, even if I couldn't tell you the artist/song, given I was around 7 when the 90s ended.
There's a lot of music that I discovered relatively late in my life, bands like Foo Fighters, blink-182, Billy Joel, Nirvana, etc. Hell I don't even consider myself to have "discovered" the Beatles. I like their music but I still haven't really invested any time in consuming their discography.
TL;DR This is an extremely long post and I apologize
"Let's be vagabonds." - Yohji Yamamoto