Connolly's first trade, in the early 1960s, was as a welder (specifically a boilermaker) in the Glasgow shipyards, but he gave it up towards the end of the decade to pursue a career as a folk singer. He first sang in folk rock band The Humblebums alongside friend Gerry Rafferty and Tam Harvey, with whom he stayed until 1974, before beginning singing as a solo artist. In the early 1970s, Connolly made the transition from folk singer with a comedic persona to fully fledged comedian, for which he is now best known. In 1972, he made his theatrical debut, at the Cottage Theatre in Cumbernauld, with a revue called Connolly's Glasgow Flourish. He also played the Edinburgh Festival Fringe. In 1972, Connolly's first solo album was produced, Billy Connolly Live!, a mixture of comedic songs and short monologues.