career. He also composed one song on his own, "Ray Gun", from their first album, Thin Lizzy.

Although Thin Lizzy gained in popularity during the early 1970s, the pressures of recording, touring, and the excesses of the rock star lifestyle began to take their toll. He left the band after a New Year's Eve concert in 1973, after throwing his guitar into the air, pushing the amplifiers into the audience, and storming off stage. He stated later that he had no regrets about leaving: "I really had to leave