I was playing around at my cheapo casio keyboard the other day and came
up with this to the bridge part of Particle Man..

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.