More problems became apparent when Waters's relationship with Wright broke down. The band were rarely in the studio together. Ezrin and Guthrie spliced Mason's previously recorded drum tracks together, and Guthrie worked with Waters and Gilmour during the day, returning at night to record Wright's contributions. Wright, worried about the effect that the introduction of Ezrin would have on band relationships, was keen to have a producer's credit on the album; their albums since 1969's "More" had credited production to "Pink Floyd". Waters agreed to a trial period with Wright producing, after which he was to be given a producer's credit, but after a few weeks he and Ezrin expressed dissatisfaction with Wright's methods. A confrontation with Ezrin led to Wright working only at nights. Gilmour also expressed his annoyance, complaining that Wright's lack of input was "driving us all mad". Ezrin later reflected: "it sometimes felt that Roger was setting him up to fail. Rick gets performance anxiety. You have to leave him alone to freeform, to create ..."