Fisher-Price Change-a-Tune Piano toy.

This classic children's toy was first introduced in 1969 and has been re-released since. It features three classic tunes: "Pop! Goes the Weasel," "This Old Man," and "The Muffin Man". A child can select a tune by turning a dial on the side, and the correct song will play no matter which key is pressed. Pick up on 45th and 9th.