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Where do I find this guy???? And how do I get him?

I agree with the above post but... whatever. It's not important.

Okay, so go to Haud Village. There's a large house kind of in the center, you'll know it since it has music notes/piano keys on the gate around it. Enter it. You'll have to fight some easy Do Re Mi Elves. If you win, an event will occur.

You have to capture the Do Re Mi Elf by using Cornelio's rune... don't do anything else. After that he will automatically join you. In order for you to capture the remaining four, you have to use Cornelio. Collect them all and you can listen to A LOT of music tracks in the game (A LOT GOD DAMMIT).

Why didn't you do this in RemyD's threads instead of locking & deleting them? Because she's a girl & he's a guy?