A holiday wishlist in 2016 is a strange concept, and I’ve found mine filled mostly with things that I don’t want. In no particular order: I don’t want any more surprise election outcomes, I don’t want music and film icons to continue dying in such quick succession and I don’t want to walk into another store that’s playing Paul McCartney’s “Wonderful Christmastime.” I should have known that what I really wanted — what we all wanted — was a Christmas mixtape from Chance The Rapper and Jeremih. The surprise project arrives as a much-needed dose of relief, in particular for those faithful to the Church of Kanye West left rudderless by their leader’s newfound bromance. Last holiday season, I wrote a column on the sacred tradition of Christmas-themed rap songs, a small but undeniable canon that originated with Run-DMC’s classic “Christmas in Hollis” (which, not coincidentally, Chance parodied on last week’s SNL). In one fell swoop, Chance and Jeremih have nearly doubled the size of that canon, contributing nine original songs in a project more cohesive than it has any right to be.