There are a lot of excellent Thai musicians. You would be competing with them. Is musician on the list of prohibited occupations. Unless, of course, you are Mick Jagger!
simple. The op knew what they wanted, but did not have the correct terminology. Well, I guessed what they wanted, that wasn't hard, and tried to steer them in the right direction, not just tell them they had the wrong terminology. After all that, the op is a happy chappy, I guess that is the main thing and the point of the site
There are advantages of going back to UK for an AO visa, you use finances in the UK, and don't have to bank money in Thailand, and you can 2 years from it.