By the mid-1970s, both Cohen and Spector were on a downward slide commercially. Although he remained popular in Europe, Cohen had never achieved the success in the United States that Columbia had hoped for. Spector had created hits such as "Be My Baby" and "You've Lost That Lovin' Feelin'" with his "wall of sound" production technique in the 1960s, and had some success in the early 1970s by producing albums by John Lennon and George Harrison; however, his behaviour became increasingly erratic.