You guys have mentioned some good singers doing good music. What's to feel guilty about Linda Ronstadt or Yvonne Elliman. DK, your other picks are pretty good (bad?), and actually Ms. Elliman, for all of her talent, recorded a lot of really bad material.
Although I haven't taken them out in a long time, the Bobs (who should make you feel dopey for laughing along with them), and although they have a lot of talent, the Roches. For some reason, I always feel sheepish when I listen to the Roches, even their Christmas album, which my kids like.
Now, something more current, Whitney Houston's the Preacher's Wife. My wife complains that I'm listening to disco music.
Finally, and please, I don't mean to insult anyone by this, Diana Krall. My wife calls her albums elevator music and my best friend can't understand how I can like Tracy Chapman (for example) and also Diana Krall. I do think she's highly overrated, but I do like her, and I do feel guilty about it.