I threw this together quickly - recorded a bit with trumpet, trying to fade in and out in a way that would mask the beginning and end of notes when reversed. (Didn’t succeed but that’s ok). Reversed it. Added organ. Reversed both of those. Added accordion. Reversed everything.
Did a little mixing magic - tried to make the trumpet sound like Spaceheads, so I added a dab of flange and reverb to make its entrances more majestic.
The organ and accordion I panned on opposite sides and then processed with the same echo and flanger to unify them.
Put tape simulation on everything (couldn’t get my nice microphone to cooperate with the computer, so I figured I would go in the opposite, lo-fi direction).