The music of Chopin is a staple of every professional pianists repertoire. Not unlike other composers, Chopin produced sets of études for the piano. Every set that had appeared before Chopin accomplished its instructive task, but remained musically dry. The remarkable thing about Chopin’s etudes is their musical potency in addition to finger-twisting madness. Chopin wrote two sets of études, opuses 10 and 25. Opus 10 is dedicated to a man who would later make is own set of Transcendental Études, Franz Liszt. Chopin’s second set was dedicated to Liszt’s mistress, the Countess Marie d’Agoult.