Glyn Johns, the album's recording engineer and a longtime collaborator of the band, said that "Beggars Banquet" signaled "the Rolling Stones' coming of age. ... I think that the material was far better than anything they'd ever done before. The whole mood of the record was far stronger to me musically." Producer Jimmy Miller described guitarist Keith Richards as "a real workhorse" while recording the album, mostly due to the infrequent presence of Brian Jones. When he did show up at the sessions, Jones behaved erratically due to his drug use and emotional problems. Miller said that Jones would "show up occasionally when he was in the mood to play, and he could never really be relied on: