Eileen Sherman & The Indie Collaborative Musically Celebrates Earth Day at Carnegie Hall Next Month by Brad Balfour Indie Collaborative co-founder Eileen Bluestone Sherman likes having her hands full. She's a playwright, lyricist, young adult novelist, television writer, theater/music producer – and producer of events such as "Celebrating Earth Day in Song." The Indie Collaborative Earth Day concert returns to the Weill Recital space in Carnegie Hall on April 25th. More than