Listen to Études, Op. 10: 5. Study in G flat major 'Black Keys' online. Études, Op. 10: 5. Study in G flat major 'Black Keys' is an Unknown language song and is sung by Beautiful Pianists. Études, Op. 10: 5. Study in G flat major 'Black Keys' , from the album Perfect Piano The 200 Best Piano Classics Part 1, was released in the year 2018. The duration of the song is 2:03. Download Unknown songs online from JioSaavn.