The lead singer for the U.S. musical group best remembered for the 1966 hit “The Sun Ain’t Gonna Shine Anymore” has died. The death of Scott Walker, frontman of the 1960s pop group the Walker Brothers, was announced Monday by his record company, 4AD. He was 76.

The announcement called Walker “a unique and challenging titan at the forefront of British music.” No details about Walker’s death were provided.

Born Noel Scott Engel in Hamilton, Ohio, Walker and his bandmates in the Walker Brothers, who were not related, all adopted the show business last name Walker — guitarist and singer John Maus had already been using the name John Walker for a few years, and drummer Gary Leeds, formerly of the Standells, eventually became known as Gary Walker.

The band formed in Los Angeles in 1964, but soon relocated to the United Kingdom and found its greatest success there, scoring No. 1 U.K. hits not only with “The Sun Ain’t Gonna Shine Anymore” (which made it only as high as No. 13 on the U.S. charts), but also with “Make It Easy on Yourself” in 1965. Other U.K. hits included “My Ship Is Coming In” (which peaked at No. 63 in he U.S. in 1965 but was a No. 3 hit in the U.K.), “Another Tear Falls,” “(Baby) You Don’t Have to Tell Me” and “No Regrets.”

With its U.K. success, the U.S.-based group stood as a counterpoint to the mid-1960s British Invasion and the popularity of U.K. groups such as the Beatles in the U.S. Following the group’s dissolution, Scott Walker remained in the U.K. and came to be thought of as a British singer-songwriter, becoming a British citizen in 1970 and eventually establishing himself as a 21st century avant-garde musician.