Heinrich Ernst Kayser was a German violinist, violist, pedagogue, and composer. Some of his most famous works include Grand duo concertant in B♭ major for clarinet (or violin) and viola, Op. 2; 36 Etudes for violin, Op. 20; Duo concertant for clarinet and viola, Op. 27 (1865); Neueste Methode des Violinspiels, Op. 32; 4 Sonatas for violin, Op. 33; 36 Etudes for viola, Op. 43; Nouvelle méthode d'alto (New Viola Method; Neue Schule für Bratsche), Op. 54 (published c.1880); and 4 Kinder-Sonatinen, Op. 58.