Jim from Ear Monkey Music added some rosin to his bow for this tinker with the extraordinary Leaf Audio Microphonic Sound Box - its an unusual sort of audio playground with mics and effects, springs, contact mics and various other places to tap, scrape and scratch. Its a sound designers dream.
The Microphonic Sound Box is available to buy as a DIY kit from:
https://www.leaf-audio.com/diy-machines/microphonic-soundbox/
Price is £215/$245
The Avila Brothers talk about their journey to the recent Super Bowl Halftime Show