In in the centre of Barcelona busking is illegal except for those who have a permit. I don't know what the critiera are for giving out permits, but from what I've seen one of the prerequisites must be 'easy listening'. Barnakustica Trio seem to be veering between that and jazz freakout.
Daniel Bica was hiding down an alleyway in Girona, playing his guitar. I suspect this is because in Girona buskers need a permit, and Daniel Bica doesn't seem like the kind of man who believes in permits.