Hammond B3

Peter Gabriel had owned a Hammond B3 with a Leslie 122 rotating speaker, which was played by keyboard players Simon Clark on the So album and by David Sancious on the Passion soundtrack and Up albums.

Although Gabriel was a fan of the Hammond, he didn't know how to use it and both Simon Clark and David Sancious were masters of the instrument, so he'd recruit them to play a few parts on the Hammond. While Gabriel decided to use the Prophet-5  for cheap organ sounds, like on "Sledgehammer".