My last real job was selling air time for CBS affiliates. I quit that when I was 28, and that was the last real job I had. I beat the system. I've been able to do this full-time for almost 15 years.
But if you want to be in a band and write music, then you should just be in a band and write music.
Simplicity is not the absence of clutter, that's a consequence of simplicity. Simplicity is somehow essentially describing the purpose and place of an object and product. The absence of clutter is just a clutter-free product. That's not simple.