Electric guitar...

If you're a Metallica fan- try "For Whom The Bell Tolls".

It's fairly basic, but a great lesson in clarity and cleanliness of playing and timing.

Plus it's got a bonus of having that bell at the beginning, which you can use to tune the E string.

When I was just starting at age 16, I would play that song six hours straight some days.

I'm sure my mom loved that.