The book that inspired the Musical Electronics Library: “Handmade Electronic Music” by Nicolas Collins.
This book is SO GREAT. It assumes no technical knowledge whatsoever. It starts out with a lot of fun projects that don’t even require soldering, such as playing the insides of a transistor radio with your fingers. There are so many good ideas here, like the Matrix Mixer, which doesn’t require power, and is perfect for turning a pile of innocuous guitar pedals into a complex, chaotic feedback oscillator. Most of the things in the book are analogue sound generators, but there are also ideas for computer controllers, eg. using hacked joysticks, and some video circuits. The emphasis is on adventurous, bold hacking and circuit bending, with a generous helping of from-scratch DIY electronics as well. The tone is always encouraging, which makes it a pleasure to read. There is a minimum of theory.
The second edition includes a DVD, which has video tutorials:
audio examples, and, best of all, a long series of 1-minute video clips submitted by hardware hackers around the world, showing off their amazing creations:
Nicolas Collins has generously shared the pdf file of his original workshop manual Hardware Hacking, upon which Handmade Electronic Music is based.