Do you know what song this melody is from?

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1

http://www.youtube.com/watch?v=S_L1pd7WqSo

2

[video:32tl0up8]http://www.youtube.com/watch?v=4-L6rEm0rnY[/video:32tl0up8]

in some way it sounds a little like this

3

[video:3g3xnh60]http://www.youtube.com/watch?v=ifha3kA_zDM[/video:3g3xnh60]
ひだまりの詩