Dion & The Belmonts Dion and the Belmonts was a leading American vocal group of the late 1950s. Their breakthrough came when "I Wonder Why" made #22 on the Billboard Hot 100 chart, and the group appeared for the first time on American Bandstand. They followed it with the ballads "No One Knows" (#19) and "Don’t Pity Me" (#40). This success won Dion and the Belmonts their first major tour in late 1958, with The Coasters, Buddy Holly and Bobby Darin, and this was followed up by the "Winter Dance Party" tour with Holly, Ritchie Valens and The Big Bopper.