This is for blushenka, but also teh_langzor, as blu didn't recommend anything to him. Firstly, you should listen to
. A really good Math Rock band that uses obscure melodies, schizophrenic drum beats, and insane time signatures, and is just... awesome. Hold Your Horse Is is probably their best. Also check out
. Shostakovich was a 20th Century Russian composer. He has a huge amount of works, but his string quartets, of which there are 16, are my favourites. Check out his 3rd and 8th String Quartets.