I Fagiolini's director, Robert Hollingworth, has always been serious about music and playful about performance.

So his amusing introductions counterpointed well the group's delightfully precise singing, whether of 16th-Century madrigals or the pieces written for this particular blend of choirs.

SDASA Chorale is a gospel choir from Soweto and their singing matched I Fagiolini's in precision and beauty.

It differed in being modern - the songs had different soloists with unique voices and it was curious seeing nascent rap-like gestures accompanying this tender and delicate music.

The Sowetans swing when they sing and it was delightful to see I Fagiolini's normally stiff, upright singers swinging along.

Roderick Williams has exploited this by taking a simple ancient tune, Douce Dame Jolie by Guillaume de Machaut, turning it into a Phillip Glass-esque round of mesmeric repetitions in three/four and four/four time and allowing the singers' bodies to sway to the differing rhythms each section was using.

With some of the audience moved to dance and others to tears - rapturous applause and a single encore brought this glorious evening's music to a close.