I was playing around at my cheapo casio keyboard the other day and came G-|A-B-C G-A-B-C G-A-B-C-C-C-D-C-B-A-G-G-A-G-F-E-G-G G-|A-Bb-B G-A-Bb-B G-A-Bb-B-B-B-C-B-A-G-G-G-A-G-F-E-G-G repeat twice, and end the second time with E-C-C instead. When I tried to play along with the tape, I had to move this into Amin instead of Cmaj, but I'm not sure if that's just because of the pitch my keyboard has or if that's the real scale they used. The rest of the song isn't too hard to figure out if you're good at playing by ear.