well in my other life not as a folk performer I am a civil service statistician and have done a fair bit of work on stats to do with employment in my time, and have to agree with others here who suggest that nobody publishes occupational stats in that much detail I'm afraid. Sorry K/van!

Partly cos in the standard occupational classifications it might go as far as 'performing musician' or somesuch but won't specify type of music performed, and partly cos even if it did they can only publish down to a certain level of detail in order to protect the privacy of the individuals concerned, when small groups of people are involved.