The Four Seasons’ sound was defined by the contrast between Valli’s powerful tenor and his soaring falsetto, supported by tight, jazz-influenced harmonies. Their breakthrough came in 1962 with the release of "Sherry." Originally titled "Terry," Gaudio re-wrote the lyrics and tweaked the melody in less than 15 minutes before a recording session. The song hit number one on the Billboard Hot 100, remaining there for five consecutive weeks.