Favorite anime sountracks/BGM

I believe there was a thread for this already but it died a long time ago so I thought I might as well just make a new topic. :u I'll start: http://youtu.be/NH6ZiySBy_w http://youtu.be/Y2t3osgTU2I http://youtu.be/JuDuymgsA2c http://youtu.be/GxnRhRLIudk