We said it back in the spring and we’ll say it again now as we’re staring down autumn: King Princess‘ set at Boston Calling was one of our absolute faves, and we’re hard pressed to remember experiencing a better song in that festival setting than her debut alt-R&B jam “1950.” Tonight (October 29), the 20-year-old Brooklyn musician born Mikaela Mullaney Straus Boston’s House of Blues, just a few days after the highly anticipated release of debut album Cheap Queen. Wrap your head around it, to the best of your ability, before the gates on Lansdowne swing open in a few short hours. And score some last minute tickets here. Consider it the treat before tomorrow’s trick.