Had an artist tell me this once and it stuck with me ever since. He was referring to paintings, but has generally held for every other artistic endeavor.
Looking through history art has always been commercial - it's just the audience that changes.
For music, musicians who got paid used to be focused on the tastes of just the wealthiest folks who liked to go and be seen at symphonies. Nowadays, it's the artists who can fill stadiums (and get fans to buy lots of merch) that make the most bank. As such, it is often those musicians who provide a sellable brand that do best. To many, this can feel fake and plastic. But like any product designed for mass consumption, it's essential.
Looking at the symbiotic dance between artist and viewer/reader/listener is really something special, and helps to provide context for changes in trends.
You could be the best guitar player in the world, writing the best guitar solos of all time, but if you can't get people to pay for it, it's just a storage problem for your guitar.