I don't know what category of already created threads this might fit into so have made a separate one. To me, this is an amazing contemporary classical composition by Steve Reich originally released 1978. You can find the original studio recording on youtube and also the original 2008 Toyko live performance with Steve Reich performing, but for me, this is the one I really like. 
 
 It's long and it's repetitive but it slowly evolves and is truly beautiful. If you have the patience or stamina to hear it from start to finish, you will be rewarded.
 
 
 
 

Beautiful!!
I especially like how to end the music.
This is a profound music.