This guy performing at Bond Street underground station in the tunnel that takes travellers away from the Central line is called Jean Claude Madhero, native of Martinique, dweller of Paris and resident of London for fifteen years. On his website he is described as "one example of a number of artists who chose perform freely and independently outside the normal protocol of commercial institutions. Outside of any organised environment, whether a theatre or place of workshop" and then, "His music is based on Latin American, Afro-Cuba no and French influences...Jean Claude Madhero seeks to champion this unique sound, Creole music, using it as inspiration to create new and original cabaret style performances." Later on I remembered that Dixie from the Royal George Ukulele Jam (Day 74) had recommended to me a musician who performs regularly between the Central and Jubilee lines at Bond Street and I think maybe it was Jean Claude.jeanclaudemadhero.com
