away". Photographer Terry O'Neil had insisted Moon sit with the back of the chair facing the camera so as to hide his distended stomach, a result of his alcoholism. "Sister Disco" "Sister Disco" seemed to mourn the death of disco, although it could be construed to be a criticism of it. It featured complicated synthesiser tracks that were the result of hours Townshend spent programming an ARP 2600 synthesiser. The song was never performed with Moon. However, it was performed regularly when the Who toured with Kenney Jones as drummer, and quickly became a live favourite. It was included on the band's 2002 Ultimate Collection album. It was also revived for their fall 2008 tour. "Empty Glass" The song "Empty Glass" appeared as a bonus track on reissues of the album. The lyrics in this version were notable for having more suicidal undertones than those in the final version, which appeared on Pete Townshend's 1980 solo studio album Empty Glass. Most notably, the line, "Killing each other, then we jump off the ledge" was changed to "Killing each other by driving a wedge" for the latest version. Reception The album was a commercial success, going 2× platinum in the US and Canada, gold in UK, and peaking at number 2 on the Billboard Pop Albums chart. The soundtrack to Grease prevented Who Are You from achieving number 1 status in the US. The success of Who Are You generated excitement at the prospect of a new Who tour for the album. The songs on the album were later performed on tour in 1979, when the Who were joined by new drummer Kenney Jones and keyboardist John Bundrick. Reviewing in Christgau's Record Guide: Rock Albums of the Seventies (1981), Robert Christgau said: "Every time I concentrate I get off on some new detail in Daltrey's singing or Townshend's lyrics or Entwistle's bass parts--though not in Moon's drumming, and I still don't relate to the synthesizer. But I never learn anything new, and this is not my idea of fun rock and roll. It ought to be one or the other, if not both." Live performances Across the band's entire career, only four of the songs on the album ("Sister Disco", "Music Must Change", "Trick of the Light" and "Who Are You") have been played live. "Who Are You" was the first of the album's songs to be performed live; this was