At age eleven, in 1956, he was introduced to trombonist Rico Rodriguez, who took him to Clement Dodd's studio, where he recorded his first single, "My Treasure".

[2] Further singles followed, including "Turndown Date", as Jamaican music transformed from rhythm and blues to ska, with backing from The Skatalites.

[2] When The Sensations split, Campbell emerged as leader of his own new vocal group, The Eternals, with Ken Price and Errol Wisdom, recording perennial favourites such as "Queen of the Minstrel" and "Stars".

[3] By the late 1970s, Campbell's popularity had begun to wane and he increasingly concentrated on love songs, and after the mid-1980s, new recordings were less common, although he has maintained a strong following.

The Uniques were revived in the late 1970s, with Campbell joining Jimmy Riley and Lloyd Charmers in the group.