How do I get through the locked door

Hint 1 of 6:

You're going to have to trick the man inside into coming out.

Hint 2 of 6:

This is going to take two people to solve this puzzle.

Hint 3 of 6:

Have you been to visit the piano player?

Hint 4 of 6:

You should send Henry over to him.

Hint 5 of 6:

Have Henry put some money in the bowl, and request a song.

Hint 6 of 6:

Then, Indy can go inside.