Should artists have the right to freedom of political expression?

Since the war in Gaza broke out there has been a crisis of censorship in the arts sector around the world, in what the not-for-profit group Freemuse is calling a most alarming moment for freedom of expression. Here in Australia pianist Jayson Gillham had his concerts cancelled after speaking about the killing of journalists in Gaza, and arts organisations have lost millions in funding from donors. So what rights do artists have to express political views? And what should the consequences be?