Chrismukkah (Christmas and Chanukah) is what the half-Jewish, half-Christian Cohen Family of "The O.C." celebrates at holiday time-and Music From The O.C.: Mix 3 (Have a Very Merry Chrismukkah) is its soundtrack. Featuring holiday-themed songs by Modern Rock favorites heard either in last year's or this season's Chrismukkah episode, Have A Very Merry Chrismukkah is a musical holiday gift for the modern family.