Mr. Miller was introduced as ??a musical treasure,?? and indeed, he has a trove of stories and songs, both familiar and obscure, about Jerome Kern, Richard Rodgers, Irving Berlin, Harold Arlen, and other composers usually associated with the ??Great American Songbook.?? Having decided that a career as a classical musician wasn??t for him, Mr. Miller was around 20 years old when he heard a recordin