Paul McCartney Joins Damon Albarn Onstage in London

Former Beatle Paul McCartney joined Blur's Damon Albarn and the rest of the 80-member music collective known as Africa Express for a performance on Saturday night at Granary Square in the King's Cross section of London, reports the Guardian. McCartney, a special guest during the final stop of the week-long Africa Express tour through the U.K., performed a pair of tunes by his post-Beatles outfit Wings.

Other highlights of the London show included South African rapper Spoek Mathambo's reworking of the Joy Division classic 'She's Lost Control' and Albarn collaboration with Malian singer-songwriter Rokia Traore's for a duet on Gorillaz's 'On Melancholy Hill.' In addition to McCartney, other special guests on hand Saturday included Gruff Rhys of the Super Furry Animals and former Led Zeppelin bassist John Paul Jones.

The Africa Express collective of musicians -- which also included former Libertine Carl Barat and Jon McClure of Reverend and the Makers -- had traveled across the U.K. on a specially chartered train, playing one-off concerts and impromptu pop-up gigs at schools and venues in Leeds, Middlesbrough, Glasgow, Manchester, Cardiff, Bristol and other cities before heading to London on Saturday.

The tour was part of the London 2012 festival celebrating the Olympic and Paralympic Games.