Then you really have no idea. I don't mean to be rude, but many artists play over here quite independently, they have no financial backing from anyone, and are lucky to draw even. They jump on Eurostar, travel to London, stay at friend's homes. They invariably don't make their living from it, so it wouldn't be tax deductible, merely an expense that will deter them. I've played several times in Europe as a solo artist. I also did a talk at the Royal College of Music in Stockholm before Christmas. In future I will require a visa for those, which will make the cost prohibitive.