Boston rapper Michael Christmas is set to embark on a huge tour with Mac Miller this fall, and tonight he released a new song in preparation for that and his upcoming project. "Who?" is a jazzy Qreamybeats produced track that has minimal bells and whistles, leaving the spotlight on Christmas to weave his way through the lush drum patterns. Showing off his witty personality, he goes from rapping about his Tinder page, to threatening to leak his own album before a funny call back to Mike Jones' old "Who" adlib on the chorus. Surely there will be no fans on Mac's tour asking who he is when he starts in November. Check out "Who?" below, and keep a look out on Michael's new project soon.