This is very nice,i don't like his music tbh but it doesn't matter i would gladly give a small tip to this guy only cause he accepts bitcoin 
Most street performers are so bad they can't earn enough money to pay for their bus ticket back home. That one will need all the tips he can get, but he's so bad any Bitcoin tips will probably be less than the fees used to send them. He'd be lucky to get a one sat tip.