Stevie Nicks/Vanessa Carlton

It seems like a strange pair. Stevie Nicks, the Queen of Rock 'n' Roll, and Vanessa Carlton, the singer-songwriter who more or less hasn’t been in the limelight since her 2002 piano smash “A Thousand Miles.” But the two, though decades apart in age, have been friends for some time now. Nicks even officiated Carlton’s wedding to Deer Tick’s John McCauley. And they’re on the road, playing all of the hits separately and also a couple together. (Laura Morrrison)