I remember having heard a song containing the following:
Diddeling dong bell, School is Over
Bells are chiming, it's so divine
That's all I can recall from the song. It's a woman singing and she sounds a bit like Connie Francis - though I don't think it's her. More probably a girl-group.
I guess that the song is from late 50's or early 60's.
Hope someone here can help me.