Fronted by the powerful falsetto of Frankie Valli, what American vocal group achieved 1960s stardom with hits like "Sherry," "Big Girls Don't Cry," and "Walk Like a Man"?

The Four Seasons

The Four Seasons were one of the most successful American groups to maintain chart dominance during the British Invasion. Their story and music were later dramatized in the Tony Award-winning Broadway musical Jersey Boys.