It is one of the most beautiful pieces of jazz ever composed. Listening to it is like watching falling snow through a window. The room is warm, something is roasting in the oven, and outside, the flakes are falling faintly through the universe. This is where you want to be forever. This is Vince Guaraldi’s “Christmastime Is Here.” Tonight, the Piano Starts Here series, curated by Wayne Horvitz and Tim Kennedy, features music from Guaraldi’s score for the TV special (and American cultural institution) A Charlie Brown Christmas, with music performed by Dawn Clement, Chris McCarthy, Michael Stegner, and others. (Royal Room, 5000 Rainier Ave S,, 5:30 pm, by donation, all ages)