For a very British take on the Tiny Desk Concerts rightly celebrated by @pajp below you could do worse than to try the Black Cab Sessions – all your favourite musos have one take to play a song recorded in the back of a black cab. This one with RT, Judith Owen and Debra Donkin playing a mournful medieval carol while crammed into the back of a cab with a guitar, a large drum and a cameraman, is favourite of mine, but there are dozens of them in the link.

http://blackcabsessions.com/