Here’s a passage from Anne Lamott’s Bird by bird: Some instructions on writing and life.
Having a likable narrator is like having a great friend whose company you love, whose mind you love to pick, whose running commentary totally holds your attention, who makes you laugh out loud, whose lines you always want to steal. When you have a friend like this, she can say, “Hey, I’ve got to drive up to the dump in Petaluma – wanna come along?” and you honestly can’t think of anything else in the world you’d rather do. By the same token, a boring or annoying person can offer to buy you an expensive dinner, followed by tickets to a great show, and in all honesty you’d rather stay home and watch the aspic set.
I don’t know of a better explanation of why good writing – not good subject matter – really matters if you’re trying to sell something. That includes new music.