"Fat Old Sun" was performed live by Pink Floyd from 1970–71 on the
Atom Heart Mother World Tour. On stage, the song was expanded and given a full electric arrangement in contrast to the acoustic-based studio recording, sometimes lasting as long as fifteen minutes. It was dropped from the live set when
The Dark Side of the Moon began to be performed in 1972. Pink Floyd performed the track for two BBC In Concert recordings at the
Paris Theatre. These were later released on the box set
The Early Years 1965–1972. The song was adopted by David Gilmour and performed acoustically in the 2001/02
David Gilmour in Concert shows, minus the electric guitar solo. When the Floyd's manager,
Steve O'Rourke, died in 2003, Gilmour, Wright and
Nick Mason played "Fat Old Sun" and "
The Great Gig in the Sky" at O'Rourke's funeral. Early during the tour in support of Gilmour's
On an Island album in 2006, the song returned to the set list. This incarnation was composed of the lyrics followed by the concert's backing singers repeating the "sing to me" chorus, then a bluesy version of the
guitar solo closer to the length of the album version (the 2006 incarnation clocked in at around seven minutes). A performance from the Royal Albert Hall is featured on Gilmour's DVD,
Remember That Night. It is also featured on Gilmour's live album
Live in Gdańsk. "Fat Old Sun" was performed during Gilmour's 2015–16
Rattle That Lock Tour and features on his 2017 live release,
Live at Pompeii. Gilmour also performed the song at
Richard Thompson's 70th birthday concert in September 2019. In 2024, the song was resurrected once again by Gilmour for his
Luck and Strange tour. Since 2015, Gilmour has added jazzy organ solo to all performances of the song between the final verse and the guitar solo. ==Reception==