G-flat major Rondo-Finale of his Seventh Symphony. Mahler's Tenth Symphony was composed in the enharmonic key of F-sharp major. This key is more often found in piano music, as the use of all five black keys allows an easier conformity to the player's hands, despite the numerous flats. Austrian composer Franz Schubert chose this key for his third impromptu from his first collection of impromptus (1827). Polish composer Frédéric Chopin wrote two études in the key of G-flat major: Étude Op. 10, No. 5 "Black Key" and Étude Op. 25, No. 9 "Butterfly". French composer Claude Debussy used this key for one
Service in B-flat major, Op. 10 (Stanford) Brahmsian symphonic technique to the needs of the Anglican liturgy." A 2010 recording "The Feast of Saint Peter the Apostle at Westminster Abbey", celebrating the patron saint of Westminster Abbey, contains four of the ten parts, performed by the Choir of Westminster Abbey and organist Robert Quinney, conducted by James O'Donnell. Service in B-flat major, Op. 10 (Stanford) Service in B-flat major, Op. 10, (full title Morning, Evening and Communion Service in B-flat) is a collection of Anglican church music by Charles Villiers Stanford for mixed choir and organ containing the Canticles for each of the principal services of the