Boone, North Carolina’s Rainbow Kitten Surprise headlined Showbox SoDo on May 3rd, just a few weeks following the release of their big label debut album, How to: Friend, Love, Freefall. I’ve read the band doesn’t like classifying their sound, but for production duties on How to. . . they worked with Jay Joyce. Joyce has produced artists such as Carrie Underwood, Little Big Town and Keith Urban, putting Rainbow Kitten Surprise in the category of music that knows how to cross over. Indie-folk duo Caamp, from Ohio, opened.