Billy Mayerl, as pianist-composer-celebrity-educator, was a unique figure in British music from the 1920s to the 1950s. While known to several generations as the composer of Marigold, Mayerl's accomplishments were amazingly varied. One of the most significant contributors to the genre of novelty piano, which succeeded ragtime and overlapped with early jazz, he also wrote more contemplative pieces belonging to the English pastoral tradition. Between...