26/03/2013 09:55 GMT | Updated 27/03/2013 08:29 GMT

Boris Johnson Busking With Misha B At Launch of Gig 2013 At London Bridge

Boris Johnson joined pop singer Misha B on Tuesday to promote Gig 2013, the annual talent competition for buskers on the London Underground.

The competition gives young musicians the opportunity to win a coveted year long busking licence on the Underground. Singer Misha B used busking to overcome her stage fright before finding fame on the British X Factor TV show.

What song do you think they were playing?