A toy includes a housing, a plurality of buttons arranged to initiate playback of a tune or other sounds, a transparent enclosure containing a plurality of balls, an agitator extending into the enclosure, a motor mounted within the housing for causing the agitator to oscillate and propel balls that encounter the agitator against the walls of the enclosure, a sound generator and speaker, and control circuitry for causing the sound generator to play selected sounds upon pressing of one of the buttons, and for intermittently activating the agitator during playback of the sounds. The housing of the toy may be arranged to resemble a piano, and the buttons may be configured to resemble keys of the piano.