A cache of privately recorings from pianist William Kapell’s last tour (he died in a 1953 plane crash in Australia at the age of 31) has surfaced. “The emergence of these more than three hours of recorded music is a tale of serendipity, of a collector’s passion and of a music lover’s act of selflessness. And when the recordings, preserved on three 16-inch acetate discs, are turned over to Kapell’s widow at a New York restaurant tomorrow, a new chapter will begin: the question of whether they will be commercially released.”