3 Unlikely Drum Machines

What do soup cans, gum balls, and eggs have in common? Well, besides being round, they’ve all been used to trigger programmable drum machines:

The Drum Buddy
Triggered by light shining through holes in a large aluminum can.

Bubblegum Sequencer
Triggered by colored gum balls placed on a grid.

“Almost Certified”
Cumputer sequencer triggers hammers that hit various sized eggs… for some reason.