NPR Music's Tiny Desk Concert series, in which musicians perform in the NPR offices, has a huge following on YouTube and has hosted artists from across the musical spectrum. Recently they were visited by The King's Singers who performed 'I'll Follow the Sun' (Lennon/McCartney), 'Shenandoah', 'Horizons' (bu Peter Louis van Dijk) and Lassus's 'Dessus le marché d'Arras'. 

The King's Singers celebrated their 50th anniversary last year and you can enjoy a gallery of photographs of the ensemble's changing lineup here. The Tiny Desk Concert performance is below: