Southperry can count to 10 but can it sing a song?

Bonus points if someone guesses this without Googling. But knowing you all.. yeah. You will.

mitsumete ita nagareru kumo wo
kanjite ita kawaru sora no iro wo
tachidomatta bokura wa kizuku
utsuroi yuku sekai ga tsumugu uta ni
nobash`ita yubi de taguru you ni
tada hitotsu kawaranai mono sagasu
kazasu te ni tomoshibi wo
asu e to tsuzuku chiisana shirube
ima mo mada kodama suru
ano hi no kotoba chikai ni kae boku wa yuku