The Necessity of Rainbows. Barnes and Noble, March 7, 1997. To help promote the Yip Harburg centennial exhibition at Lincoln Center’s Billy Rose Performing Arts Library (1996-97), the Yip Harburg Foundation presented a book-signing event at Barnes and Noble book store for Who Put the Rainbow in The Wizard of Oz. Speakers were Ernie Harburg and Barbara Stratyner (curator of exhibitions, NY Public Library for the Performing Arts); singers were Tommy Hollis, Nancy Opel and pianist-singer Jimmy Roberts. This recording is not a commercial product and is available only from The Yip Harburg Foundation.