Some of Hoya's violin studies from Moderne Lagenstudien für Violine (1913) and Grundlegende Doppelgriff-Studien (1906) are in Seybold's Neue Violin-Etüden-Schule, Op.182 - Book 5, No.5, and Book 8, No.1. Born in America, studied in Berlin, taught in Linz.
