Warner Bros. pushed for the duo to extend the tour and release a new studio album. Simon had new material ready, and, according to Simon, "Artie made a persuasive case that he could make it into a natural duo record." However, the duo quarrelled again; Garfunkel refused to learn the songs in the studio and would not give up his longstanding cannabis and cigarette habits, despite Simon's requests. Instead, the material became Simon's 1983 album "Hearts and Bones". A spokesperson said: "Paul simply felt the material he wrote is so close to his own life that it had to be his own record. Art was hoping to be on the album, but I'm sure there will be other projects that they will work on together." Another rift opened when the lengthy recording of Simon's 1986 album "Graceland" prevented Garfunkel from working with engineer Roy Halee on his Christmas album "The Animals' Christmas" (1985). In 1986, Simon said he and Garfunkel remained friends and got on well, "like when we were 10 years old", when they were not working together.