Cuckoo, cuckoo, cuckoo what do you do? In April, I open my bill In May, I sing night and day In June, I change my tune In July, far far I fly In August, away I must... Cuckoo, cuckoo, cuckoo what do you do? In April, I open my bill In May, I sing night and day In June, I change my tune In July, far far I fly In August, away I must...