His band on the verge of capping off a recent eight-week tour of the United States, Coldplay frontman Chris Martin admits he's bone weary: ''I really feel a bit spent, like an actor after a long day of porn shooting.''

Still, Martin says, it's a good sort of tiredness, like when the endorphins kick in after a strenuous stretch of exercise -- or copulation. And he does find America to be an ''amazing place.'' Just about everyone he's met here, from fans to promoters to record-company worker bees, has been ''unbelievably cool'' to him and his mates.

One thing about this particular Stateside jaunt, however, sticks in his craw. ''Thom Yorke ignored me at a hotel in Los Angeles,'' he says. ''I was secretly a bit gutted. I'm sure he recognized me. I always look at it like we're in a big musical high school and Radiohead is in the year above us and they still haven't come and sat with us at lunch.''