Nat Joseph, who had signed The Humblebums and had nurtured their career, was concerned that Connolly find a way to develop a distinctive solo career just as his former bandmate, Gerry Rafferty, was doing. Joseph saw several of Connolly's performances and noted his comedic skills. Joseph had nurtured the recording career of another Scottish folk entertainer, Hamish Imlach, and saw potential in Connolly following a similar path. He suggested to Connolly that he drop the folk-singing and focus primarily on becoming a comedian. 1970s In 1972, Connolly made his theatrical debut, at the Cottage Theatre in Cumbernauld, with a revue called Connolly's Glasgow Flourish. He played the Edinburgh Festival Fringe with poet Tom Buchan, with whom he had written The Great Northern Welly Boot Show, and in costumes designed by the artist and writer John Byrne, who also designed the covers of the Humblebums' records. Also in 1972, Nat Joseph produced Connolly's first solo album, Billy Connolly Live!, a mixture of comedic songs and short monologues that hinted at what was to follow. In late 1973, Joseph produced the breakthrough album that propelled Connolly to British stardom. Recorded at a small venue, The Tudor Hotel in Airdrie, the record was a double album titled Solo Concert. Releasing a live double-album by a comedian who was virtually unknown (except to a cult audience in Glasgow) was an unusual gambit by Joseph but his faith in Connolly's talent turned out to be warranted. Joseph and his marketing team, which included publicist Martin Lewis, promoted the album to chart success on its release in 1974. It featured one of Connolly's most famous comedy routines — "The Crucifixion" — in which he likens Christ's Last Supper to a drunken night out in Glasgow. The recording was banned by many radio stations at the time. In 1974, he sold out the Pavilion Theatre in his home town. In 1975, the rapidity and extent of Connolly's breakthrough was used to secure him a booking on Britain's premier TV chat show, the BBC's Parkinson. Connolly made the most of the opportunity and, ignoring objections from his manager, told a bawdy joke about a man who had murdered his wife and buried her bottom-up so he'd have somewhere to park his bike. This ribald humour was unusually forthright on a primetime Saturday night on British television in the mid-1970s, and his appearance made a great impact. "When I