Not sure if you're into 40s music, but there's a little known instrument called a theatre organ. It was conceived when silent films were taking off, and theaters needed some form of background music. Paying an organist was much cheaper than hiring a whole orchestra, so a lot of theaters opted to get an organ as a cost saving measure (imagine, lol). Anyways, a few have survived, and I learned the basics of playing one. It's an absolutely incredible instrument, in terms of the sheer amount of sounds you can make with it. Someone played the star wars overture for example[1]. It also has one of the most flexible interfaces, with the tabs, second touch, and sustenuno pedal on the volume foot controls. It's inspired a lot of my own tinkering with custom sound synthesis too.

[1] https://youtu.be/I2S72eajLzw