Director-librettist and co-lyricist Nelson and lyricist composer Gordon will discuss the evolution of their new musical based on Marcel Proust's "Remembrance of Things Past." Selections of the show — about composer Marcel, who is presenting in his salon a tiny theatrical about the love of his life — will be heard at the museum, weeks prior to the Feb. 18 first performance by Playwrights Horizons. Nelson won the Tony Award for Best Book of a Musical for James Joyce's The Dead. Admission is $18 or $15 for members, seniors and students. The Guggenheim is at Fifth Avenue and 89th Street. For information, call (212) 423-3587. Visit www.worksandprocess.com.