Feared, ostracised and murdered: how music saved the Tanzania Albinism Collective

They are persecuted in their homeland, but music is now changing their lives. Meet the Tanzanians who play with sledgehammers, chant in Swahili - and dance till they drop

It is a Wednesday night in a London pub and a group are about to play their first ever gig. It doesn't begin well. Some members start singing the wrong song, the keyboard won't work properly and they don't all finish at the same time.

But then something happens: the audience claps. The four singers look stunned and overwhelmed, and then Teleza Finias, the band's only woman, starts jumping up and down with joy. Amidu Didas, a lanky singer in a woolly Arsenal hat, shakes his arms in celebration, while Elias Sostines and Riziki Julius, the other two members, shout, "Tanzania! Tanzania! Tanzania!" over and over, making the crowd shout it back.