 A mother (Marsha Hunt) wants her son (William Prince) to grow up to be a pianist good enough to play at Carnegie Hall but, when grown, the son prefers to play with Vaughan Monroe s orchestra. But Mama s wishes prevail and the son appears at Carnegie Hall as the composer-conductor-pianist of a modern horn concerto, with Harry James as the soloist. Frank McHugh is along as a Carnegie Hall porter and doorman, and Martha O Driscoll is a singer who provides the love interest for Prince. Meanwhile and between while a brigade of classical music names from the 1940 s (and earlier and later)appear; the conductors Walter Damrosch, Bruno Walter, Artur Rodzinski, Fritz Reiner and Leopold Stokowski; singers Rise Stevens, Lily Pons, Jan Peerce and Ezio Pinza, plus pianist Arthur Rubinstein, cellist Gregor Piatigorsky and violinist Jascha Heifetz.