Frankie Valli ( born Francesco Stephen Castelluccio ; May 3 , 1934 ) is an American popular singer , known as the frontman of The Four Seasons beginning in 1960 .
Frankie Valli ( born Francesco Stephen Castelluccio ; May 3 , 1934 ) is an American popular singer . He is most famous as frontman of The Four Seasons beginning in 1960 .