People really need to learn to NOT quote posts with videos embedded in them... also the amount of wussy music in this thread is highly disturbing. I tried to submit just bands most people have never heard of, help you expand.
[youtube]http://www.youtube.com/watch?v=_zDXwQ05NDA[/youtube]
Pagan metal (German band/lyrics). Extremely long, extremely amazing...if you're super impatient, it really kicks in about 4:45 in.
[youtube]http://www.youtube.com/watch?v=vKZ-eKBJ9dw[/youtube]
Progressive/technical/mathcore.
[youtube]http://www.youtube.com/watch?v=bMKJO5moJ-8[/youtube]
Melodic death/groove metal.
[youtube]http://www.youtube.com/watch?v=f_QRrDReegw[/youtube]
Gypsy punk...that's right, Gypsy punk, not a typo.
[youtube]http://www.youtube.com/watch?v=w4XJkIL8N1U[/youtube]
Swedish power metal.
[youtube]http://www.youtube.com/watch?v=ggyC0FOzqHM[/youtube]
Scottish Pirate metal. They have better songs than this, but this is the newer of the 2 with an actual video. They may be gimmicky, but they're one of few bands where I actually like every song they have, with 3 full albums.
[youtube]http://www.youtube.com/watch?v=4t_yQPZvVnI[/youtube]
"A cappella hero metal," they have a drummer and 5 vocalists; 1 male singer, 1 female singer, 2 guys doing guitar vocals and 1 doing bass vocals. They even do a Master of Puppets cover
http://www.youtube.com/watch?v=HSpuVsLnl1k