As much as I love "約束" (Yakusoku { Promise ).
The first one is "Onaji Takami e" and the other is "Toki wo Kizamu Uta"
It roughly translates to "To the Same Heights" and "Song which passes the time"
Both songs use the same tune. And that's because "To the same heights" was originally used in the game.
"Toki wo Kizamu uta" was then created with lyrics and was used for the Anime. :)
I think they have a vocal version of "Yakusoku", but I cannot find it anywhere. :(
Anyway, here's the song! :)
If you're very emotional, get tissues ready.
If you've finished Clannad, you'd need a whole box. :)
Btw, to stop the music that is already playing, click the pause button on the purple circle on the right. :)
I really do love it.