Increasingly, throughout the summer and into the fall of 1967, copious drug use (especially LSD) and pressure by the record company to constantly write new hit songs continued to take a toll on Barrett's mental state. He became unable to make a meaningful contribution to the group on stage, playing his guitar incoherently and sometimes not playing at all. By the time of the band's first tour of the US in early November 1967, his condition was plainly showing. He stared blankly into space on their 4 November "American Bandstand" performance, listlessly strummed and barely managed to mime the vocals to "Apples and Oranges". On 5 November, things got worse: they appeared on "The Pat Boone Show" and Barrett sat in stubborn silence, refusing to answer any question put to him. He also refused to mime to "See Emily Play": Waters was forced to mime the track instead (Waters confirmed this on the "VH1's Legends: Pink Floyd" episode). After 22 December show, the rest of band quietly put out word that they were in need of a guitarist.