My kid is
exposed (not converted) to a very broad range of sounds, from children music to pretty much everything we listen to in our home. I'm sure he'll discover the "wonderful" world of mainstream on his own. In a way he's doing that in school with his friends, and he doesn't really like it. For now he likes this:
In fact, he has decided that Trans Am is his favorite band (based on this song mostly), whatever that means in his age
. Oh, I forgot to mention, he's 8. But, the point is he picks these sounds rather naturally, passing through, and a lot of it catches his attention.