Rod Stewart, who started his career in the '60s by singing on the streets -- known in England as busking -- did just that earlier this week when he joined street performer Henry Faceyfor an impromptu runthrough of “Handbags and Gladrags” in London’s Piccadilly Circus.

Stewart is not the first musician to have sat in with a street performer recently. Others who have been moved while passing by include Bono and Steven Tyler.

It's part of a charity-driven incentive led by Roger Daltrey.