Posted this a while back but figured it’s worth sharing again. These are some classic electronics books with great info relating specifically to audio circuits.

Handmade Electronic Music by Nicholas Collins - Excellent resource if you are just starting out!!

Engineer’s Mini Notebooks on Op Amps by Forrest Mims III - Also great for beginners with slightly less hand holding

CMOS Cookbook by Don Lancaster - Upper beginner to intermediate

The Art of Electronics by Horowitz and Hill - When you are ready to start getting more serious

Small Signal Audio Design by Douglas Self - Solidly intermediate but a great reference and explains the “why’s” nicely