The Beatles sought to inject an atmosphere of celebration into the recording sessions. Weary of the bland look inside EMI, they introduced psychedelic lighting to the studio space, including a device on which five red fluorescent tubes were fixed to a microphone stand, a lava lamp, a red darkroom lamp, and a stroboscope, the last of which they soon abandoned. Harrison later said the studio became the band's clubhouse for "Sgt. Pepper"; David Crosby, Mick Jagger and Donovan were among the musician friends who visited them there. The band members also dressed up in psychedelic fashions, leading one session trumpeter to wonder whether they were in costume for a new film. Drug-taking was prevalent during the sessions, with Martin later recalling that the group would steal away to "have something".