Gone Missing is a wry and whimsical documentary musical about things that go missing -- keys, personal identification, a Gucci pump...or one's mind. The show is a collection of very personal accounts of things lost and found, creating a unique tapestry of the ways in which we deal with and relate to loss in our lives.  Devised from interviews with real-life New Yorkers by The Civilians, a New York-based company producing new work from creative investigations, with music and lyrics by Michael Friedman.   This 80-minute, one-act musical is performed with no intermission. Part of the proceeds from this show will go to benefit the Michael Friedman Legacy Fund.