Would like to know as well. Whenever I suggest something new it's a default "NO!". But if it just happens naturally it's ok. Like if I put on a song and suggest he listen to it, my kid will literally scream and cry like I'm torturing him, but if it happens to be on the radio while driving then suddenly it's fine and he'll love it. I think part of the reason is that everything is on demand these days, unlike when we grew up on broadcast tv and radio.