The song is Somewhere Only We Know by Keane. The animes used are 5cm Per Second, Hanbun no Tsuki ga Noboru Sora, and Ano Hana.
This is a collab by:
xhopelesslove (5cm Per Second):
http://www.youtube.com/user/xhopelesslove
invidiainblue (Hanbun no Tsuki ga Noboru Sora):
http://www.youtube.com/user/invidiainblue
hauntingsecrets (AnoHana):
http://www.youtube.com/user/hauntingsecrets
