The next single, "Are 'Friends' Electric?" was very successful, reaching the No. 1 spot. By the end of 1979 it had become the fourth highest selling single in the UK that year. The underlying context of this song was also a reference to another Philip K. Dick novel, "Do Androids Dream of Electric Sheep?" A special picture-disc helped boost sales but what particularly grabbed the British public's imagination was Tubeway Army's appearance on the BBC show "The Old Grey Whistle Test", followed soon after by a slot on "Top of the Pops" on 24 May 1979. The band, now including Ultravox keyboardist Billy Currie, Chris Payne, Paul Gardiner and drummer Cedric Sharpley, appeared all dressed in black and near-motionless, Numan in particular giving a performance often referred to as being "like an android" (a style that was later reported to have been a means of covering stage nerves but which then became his trademark). The single remained at number one in the UK charts for four weeks, with "Replicas" following suit in the album charts. With Tubeway Army still avoiding live shows, Numan recruited some additional musicians to make these television appearances (see above).