In this master class, Barcelona horn professor and Mahler Chamber Orchestra soloist José Vicente Castelló begins his work with student Alma Sarsola in demonstrating and trying out different warm-up exercises, which they then apply to Schumann’s Adagio and Allegro in A-flat Major, Op. 70. Originally composed with the aim of giving amateur musicians more music to perform at home, the piece's technical challenges and artistic beauty have made it one of the most beloved works of the horn's solo repertoire.