Recently, I discovered a nice website, SoundCloud which promotes (aurally, visually and socially) music that you compose.
Or, you can use it to play a stream of compositions, by typing tags and search words.
I searched for tag, 'classical', and keyword, 'experimental', and the resulting hits sound pretty nice!
It's been out since 2007: recently 5 million registered users.
Copyright (c) 2011 Mark D. Blackwell.