The main evolutions have come about since I was 16 until now.
At 16, I listened to punk. Lots of Christian punk, lots of punkish rock, etc.
At 17, when I started college, I moved into indie rock. Lots of chill acoustic stuff, even more piano rock and bands with organs, glockenspiels, etc. Things got weird when I discovered Bright Eyes.
While 18 and 19, I dove deeper into obscure indie rock (oddly enough, many of those obscure bands are now mainstream-esque). I got more into the local music scene, so everything I loved, no one had ever heard of. O.o
At 20, I made a friend who had me listen to a lot of metal with him.
While 20 and 21, my best friend started taking me to metal shows. I fell head over heels with everything about it.
Now at 22, keeping everything I've ever loved concerning music and just adding more, I just have an intense passion and love for all good music.
The last 4 shows I've been to were: Squeeze (indie), The Black Dahlia Murder (metal), The Kooks (indie->mainstream poppy rock) and Ghostland Observatory (electro dance rock).
Right now I just listened to Amon Amarth, Alphabeat, Cartel, Buddy Holly and Elliott Smith all in a deliciously diverse row.
I suppose I didn't evolve, per say, I just hunted and gathered great music for my life's soundtrack.
<3