The surviving members of Pink Floyd took part in a tribute concert last night to pay respect to their former frontman, Roger "Syd" Barrett.

Guitarist David Gilmour, bassist Roger Waters, drummer Nick Mason and keyboardist Rick Wright all appeared on stage at the "Syd Barrett - Madcap's Last Laugh" gig, held at the London Barbican venue.

But it would appear the long-feuding Gilmour and Waters have yet to bury the hatchet. The pair appeared separately, the BBC reports, and were not photographed together.

Gilmour, Mason and Wright performed "Arnold Layne," the group's first hit and one of Barrett's best-known works. Waters performed a solo version of his own track, "Flickering Flame."

The concert was held to pay homage to Barrett, who died on July 7, 2006 at the age of 60, following complications from diabetes. The artist had spent the better part of the past 30 years living in seclusion in Cambridge, England, after being forced out of the band due to deteriorating mental health issues.

Other performers on the night included Blur and Gorillaz frontman Damon Albarn, the Pretenders' Chrissie Hynde and Soft Boys singer Robyn Hitchcock.

They then took part in an all-star finale of another of Barrett's best-known compositions, the psychedelic track "Bike" taken from the band's debut 1967 album "The Piper at the Gates of Dawn." Waters, however, did not join in.

A reunion of Pink Floyd and Roger Waters is a rare occurrence. A Waters-and-Gilmour led Pink Floyd memorably performed at the Live 8 concert in London's Hyde Park, during the summer of 2005. The previous such occasion was back in 1981, at London's Earls Court.

The Barrett concert is part of the Barbican's Only Connect series of events, which offers a podium for unusual collaborations and cross-arts experimentation. Contemporary composer Philip Glass and punk-era artist Patti Smith will take part in a performance of piano and poetry on Oct. 19, under the Only Connect banner.