Francesco Stephen Castelluccio (born May 3, 1934), better known by his stage name Frankie Valli, is an American singer and occasional actor, best known as the lead vocalist of the Four Seasons. He is known for his unusually powerful falsetto voice. Valli scored 29 top-40 hits with the Four Seasons, one top-40 hit under the Four Seasons alias the Wonder Who?, and nine top-40 hits as a solo artist. As a member of the Four Seasons, Valli's number-one hits include... [more on Wikipedia]