You must be joking? It's obvious if you actually care to look that leftist governments value the arts much more than liberal ones.
Is there a study on this? (Serious question.)
It would seem that it opens you up to the problem of other people deciding whether you're an artist or not and if so whether you're a good artist.
The same of course happens with capitalism, where it's your customers doing it. (Or in the case of books, which are almost never profitable, the VC-like publishers deciding to give you advances.)
So of course the reason modern mixed economies are good is there's more than one set of people that you may be able to convince to fund you.
> Under capitalism artist would be unable to make a profit off of their art.
Sure they would, it would just be "I got paid to do this art/music piece that then someone will use in their product they sell"
Under communism artists would be barred from making art entirely, ordered by the state to work in a place where it is deemed to be productive.