I blame the sitter. She was the first one to let Emma go to bed with anything other than "quiet music" on. We started playing Baby Mozart CDs at bedtime when Emma was an infant, and she fell asleep to nothing but those right up 'til she was 3. If we were in a strange place, classical music on a clock radio would help her go down. It worked.
Until Emma told the teenager she wanted to listen to the Disney CD that was already in her player. And that worked, too. So we started letting her pick her own bedtime music.
I should share part of the blame, though, since I bought the dreaded Tunes for Tots CDs. But that was at least two years ago. I should've thrown them out when I realized they were priced so cheaply because the music was just that bad. They're just the usual kid-song suspects ... only with bad drum machines and oft-creepy little kids singing them.
Emma's rediscovered them lately, and one of the six (yes, I bought two box sets, unheard. They were $9, total. I'm a sucker for a "bargain") CDs is a must at bedtime. Except that she doesn't like about half the songs on it. There are only 12, and given that some are in The Itsy Bitsy Spider genre, that means about 15 minutes of music. So when Em demands to start on song 6, she'll be calling in about five minutes for a new disc or a repeat of the current one.
She's still young enough that we can dictate her tastes. We never allowed Barney or Teletubbies in the house, we don't eat mac-and-cheese at every meal and her favorite songs are also favorites of ours. We let her have her own stuff, too -- encouraging her to listen to World Playground or even the Wiggles, because we don't mind dancing around the house with her to them. They sound like real music.
I've never tried to render a CD unplayable before. I bet sandpaper would do it ...