Does someone know where to find a good interpreter in Chiang Mai? Should not be too expensive. I would need this if I will record music with some Thai musicians who do not speak English very well. In that case the interpreter would perhaps even need to be present in the recording studio.

Could always have a look at the classifieds (orange button on toolbar) if you haven't already... or perhaps learn the language.

Failing both of them and if no takers, give Meadish Sweetball a shout as that type of thing's right up his alley and he'll no doubt know where to look.