So, my girlfriend and I were taking a drive with the six year old. He has a couple of his "own" CDs, but for the most part he enjoys what we listen to. His CD (They Might Be Giants / Here Come the 123's) was about to end and I was looking for something of my own to put in. Suddenly he starts chanting "Doodie Head! Doodie Head!" I asked him why he was saying that and he told me he wanted to listen to the CD with 'Doodie Head". I asked him which one that was when he responded, "You know, Doodie Head...the bubble gum song." It then hit me that he wanted Do It Again; we listen to We Are The Night quite often.
I can see how it might sound like "Doodie Head" to a little kid, especially when the words 'bubble gum' are already going to get a child's attention. We then let him know that the words are actually 'Do It Again'. He responded, "OOOOHHHH, I get it now." Sure he does. :)
For what it's worth, he seems to enjoy a good deal of electronic music, the Chemical Brothers in particular. Lucky us. His favorite track is Piku Playground (live). He says he likes the way it makes the car sound. Woo-Hoo!