The dance-pop duo Cherub sounds out of sync with most of the music that comes out of Nashville. But the guys in the group certainly don't mind. Songs such as "Monogamy," "Doses and Mimosas" and "XOXO" shamelessly draw from the '80s. And when the guys play the tunes live, the venue erupts into a wild dance party. We spoke with the duo at the House of Blues shortly before their concert at the club's Cambridge Room.