"1-Day Musical" Cuckoo Clocks feature two mechanical movements that require winding daily. At the full hour, a cuckoo bird calls the number of hours followed by a melody (for example; at 3 o'clock you will hear 3 cuckoo calls). On the half-hour, the cuckoo calls once and then a second melody plays. Three weights are visible under the clock: one for the time movement, one for the cuckoo, one for the melody.