So right now I've been listening to a lot of math rock/DJ entstep, pop and punk from the 90s, and American folk music from the fifties.
The first is a fast paced genre based on metric modulation, complex harmonic structure, and death metal. Often involving algorithm-based drum patterns, it's a very cool genre to me because it combines the pop-like qualities of regular progressive rock with a Bach-like precision that makes it very fun to listen to. I recommend bands Uneven Structure, Chimp Spanner, The Algorithm, and Circles.
The next is sort of a nostalgia trip for me, but I've been attempting to remove the music from nostalgia and see what it's all really about. Specifically, I've been listening to Aaron Carter, Blink-182, Simple Plan, and N*sync, as well as a few other similar such musicians.
And the last is really just things from this page http://img441.imageshack.us/img441/2691/folkessential1.jpg (thanks /mu/ essentials). My favorite has got to be Odetta, a black woman with an amazing voice. Just listen.
