“Who’s into Halloween?” asks Julien Ehrlich as he sits with painted face at his drum kit looking out into the crowd on Halloween night. The audience cheers and he says, “We’re like, eh on it.” The rest of his Chicago-based band Whitney laughs with him and they bust into their next song. I couldn’t tell you what it was because I was so mesmerized by the warm stage chemistry and sweet energy, the casual confidence with which Ehrlich joked then sang then joked again. A couple songs in he stopped and put his hand to his chest and said, “You know, our [...]