I actually haven’t done this with a friend in the car yet, but I’m sure it’s coming. I don’t know how many times I’ve gone out, sans baby, and not realized I’ve been rocking out to his music for a solid half hour. I don’t *think* I’ve ever made it to an hour listening to his stuff without him, but it’s possible I have and I didn’t realize it.
Also, I know a lot of people don’t listen to special music for their baby, and I wish I could count myself among those people. But he definitely seems to calm down when I switch the music from the radio to kids’ music. I guess music really does soothe the savage beast!