Our 'art' is extremely derivative and musically simple. The harmonies are unsophisticated, the technical skill of the performers is severely limited, and the overall musicianship of the popular creators (not that anyone is particularly popular in the genre, that's part of the problem) is amateur

Maybe so but I would argue that it's only a reflection of the needs of the current era. Right now the purpose of any political/dissident music is to be simple, shocking, and catchy so as to spread rapidly and propagandize people. The perverse incentives of the modern paradigm and social media simply doesn't lend to culturally significant or sophisticated music.

Pick a classical composer at random--they were probably an ethnosupremacist. But back then, there was a market. Now, to make music with any pro-White themes is professional suicide, so the class of professional musicians in our movement is virtually absent.

Well this is the kind of thing where you need to obtain power first and then it'll come to you. Think about communist music before and after coming to power. It went from simple peasant songs to full on orchestral music in the Soviet era which spread to other communist regimes as well. A similar process will happen if National Socialism returns to power.