Hip hop star Fatman Scoop bursts into song with busker on the Tube

US hip hop star Fatman Scoop burst into song on London Underground, helping a busker perform cover of 'Valerie', by Amy Winehouse.

Fatman Scoop, famously known for his 2003 song 'Be Faithful', took commuters by surprise and urged them to them to "drop a quid in..." as they passed by.

His impromptu musical performance was uploaded to his Facebook page.

Everyone seemed pretty impressed by his underground performance, with comments including: