Busker: chiefly British, to entertain by dancing, singing, or reciting on the street or in a public place.
"itinerant entertainer," 1857, from busk (v.) "to offer goods for sale only in bars and taprooms," 1851 (in Mayhew),
perhaps from busk "to cruise as a pirate," which was used in a figurative sense by 1841,
in reference to people living shifless and peripatetic lives