Hi there I found a copy of the music through JC's ABC Tunefinder. Some of the longer notes are actually broken in the song and the ending in the movie went, "mi ray doh", not "doh ray doh".

http://trillian.mit.edu/~jc/cgi/abc/Tune?F=GIF&X=53&U=http://users.erols.com/olsonw/S1.HTM&N=S1.gif

This should get you there. I don't know any way yet to simplify things. Nerves mostly I guess. And the fact that I'm in a hurry at the moment.

Sophocleese