Music generator for teddy toys

One manufacturer of teddy bears ask for a circuit that allow to the kids go to sleep giving a hug to the toy listen a melody.
So we design a melody generator based on simple tone. Contain a tone that is repeated indefinitely.
The music is programed on factory and can't be altered by the user/installer.
The circuit is powered with 2 AA battery, and for the prototype we decide reuse the EAU1 PCB.
The most part of installation is wired to reach to the extremes of the bear.