To me, every interview, even if you love the artist, needs to be somewhat adversarial. Which doesn't mean you need to attack the person, but you do need to look at it like you're trying to get information that has not been written about before.
I grew up on a farm, and we didn't have cable and only limited radio stations, so I wasn't inundated with culture the way people in other parts of the country were. But I was really interested in it.
The biggest problem in rock journalism is that often the writer's main motivation is to become friends with the band. They're not really journalists; they're people who want to be involved in rock and roll.
Book writing is a little different because, in my case, my editor is a year younger than me and basically has the same sensibility as me.