I always wanted a musical tesla coil. But never got to making one.
Lately you have such kits on ebay. I bought one for $13 and now they are still only $5. You can find them here.

Because the instructions are not very clear I made an Instrucable of how to make one your own.

https://www.instructables.com/id/Musical-Tesla-Coil-Kit-instructions/

These are the included instructions and the schematic: