You don’t have to be Jewish to revel in the rich array programs at the San Francisco Jewish Community Center. And you don’t have to carry a tune to join in their Broadway singalong Dec. 12. The music is live. The focus is on lyricists, most of whose songs are already deeply embedded in geezer memories. The evening will warm you up ecumenically for the season’s other singalong, Handel’s Messiah. Book now, tickets go fast.