Metallica and the Red Hot Chili Peppers have refused to sell their music in the iTunes Music Store because they're afraid that readily-available singles will kill the album format. This is old news, but the quote is priceless:

"We can't let a distributor dictate the way our artists sell their music," Reiter said, adding that the business terms were otherwise acceptable.

And now for some perspective:

"One of the definitions of a major record company is that you are in the distribution business... We don't simply want to be providers of content to someone else's electronic delivery system. Why would we empower someone else to do this?"

What Metallica and the Chili Pepper meant to say was that they can't let a distributor dictate how they sell music unless that distributor is also their label, in which case they can dictate what they wear, where they tour, what the records sound like, etc. That quote is from a Details article from 1994: "Totally Wired," July, p. 121.
.:link:.