↑Chris Smith (2006). Greenwood Press, 편집. 《The Greenwood Encyclopedia of Rock History: From arenas to the underground, 1974–1980》. 102쪽. ISBN978-0-313-33611-9. "the hard-rock pioneer and guitar god also become a soft-rock star in the mid-1970s. He celebrated his sobriety with (... ) the Top 5 hit "Lay Down Sally" and hit No. 16 with the ballad "Wonderful Tonight," both off his 1977 Slowhand album"