Porcupine Tree and Alcest, already mentioned. That's some incredible stuff.
Here's my input:
Rock: Black Rebel Motorcycle Club - a pretty cool rock band.
http://www.youtube.com/watch?v=Day6N6DD8XA
Kyuss - stoner metal, not exactly unheard of, but need to be listened to.
http://www.youtube.com/watch?v=CAXGu81Rk1g
Mammal - aussie alternative metal band.
http://www.youtube.com/watch?v=2PmhHPFgcwk
Silversun Pickups - cool shoegazey sound. they're getting more noticed nowadays.
http://www.youtube.com/watch?v=DmE57YE3pSc
Gallows - hardcore punk. i love it, but be warned about the lyrical content of just about all their songs.
http://www.youtube.com/watch?v=qlqiKM4suCA&feature=related
Hip-Hop: G Love and the Special Sauce - great bluesy hip hop band.
http://www.youtube.com/watch?v=-6CKkd-RLXw
Jamie T - really cool little british hip-hopper.
http://www.youtube.com/watch?v=Dwh0Wn5vVwE
...
Now, these bands are a little more difficult to get into, but they still kick ***.
Riverside - swedish prog band.
http://www.youtube.com/watch?v=dMqd7zYkQaw
Sleep - stoner metal, usually grouped together with kyuss and some other desert rock acts.
http://www.youtube.com/watch?v=zj9IAvv32wE
Tomahawk - alternative/experimental metal band headed by mike patton.
http://www.youtube.com/watch?v=Jt856_nRxQk
i wanna live like james dean, i wanna die a superstar.
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