Gallagher's second album for Chrysalis – and last with his longstanding trio of Lou Martin (keyboards), Rod De'Ath (drums) and Gerry McAvoy (bass) – was a milestone in his career. Although Calling Card was produced by Deep Purple bassist Roger Glover and not surprisingly contained some of his most powerfully driving rockers, tracks like the acoustic "Barley & Grape Rag" and the jazzy, soulful, finger snapping title cut – a perennial concert favorite – found the Irish rocker not only exploring other musical paths, but also caught him on one of his most consistent songwriting streaks ever. Even "Do You Read Me," the muscular opening track, is a remarkably stripped-down affair that adds subtle synths to the rugged blues rock that was Gallagher's claim to fame.