This also showed in the subject matter on the album, in songs such as "Got to Give It Up". Celtic influences remained, however, particularly in the album closer "Róisín Dubh", a seven-minute medley of traditional Irish songs given a twin guitar rock veneer. Two singles, "Waiting for an Alibi" and "Do Anything You Want To", were successful, and the album reached no. 2 in the UK. A third, moderately successful single, "Sarah" was Lynott's ode to his new-born daughter.
However, on 4 July 1979, Gary Moore abruptly left Thin Lizzy in the middle of another tour of the US. Years later, Moore said he had no regrets about walking out, "but maybe it was wrong the way I did it. I could've done it differently, I suppose. But I just had to leave." He subsequently pursued his solo career, releasing several successful albums. He had collaborated with Lynott and Downey on his 1978 album Back on the Streets and the hit single "Parisienne Walkways" before leaving Thin Lizzy, and in 1985 he and Lynott teamed up again on the UK no. 5 hit single "Out in the Fields". Gary Moore died of a heart attack in Estepona, Spain on 6 February 2011, aged 58.
After Moore's departure, Thin Lizzy continued the tour for a few nights as a trio before Lynott brought in Midge Ure to replace him on a temporary basis. Ure had prior plans to join Ultravox, but had co-written a song, "Get Out of Here", with Lynott on Black Rose: A Rock Legend, and agreed to help Thin Lizzy complete their touring commitments. He also contributed guitar parts for The Continuing Saga of the Ageing Orphans, a compilation album of remixed and overdubbed versions of Eric Bell-era tracks. On their return to the UK, the band were to headline the Reading Festival for the second time on 25 August 1979, but had to cancel due to the disruption within the line-up.