I don't know what it means, but it's so pretty. You've probably heard it in that commercial...AT&T maybe? I don't know.
I just know it makes me happy.
Edit: It's a GE commercial...and here's a rough translation I found
Listen to the children playing Listen to the children playing Listen to the children play in the summer I've got something I should say but it won't come out my way Summer's slipping away, let me stay in your heart today