6 Preludes and Fugues, Op. 35 / 6. Prelude and Fugue in B-Flat Major, Op. 35, No. 6 : Mendelssohn: 6 Preludes and Fugues, Op. 35 / 6. Prelude and Fugue in B-Flat Major, Op. 35, No. 6: 1. Prelude, MWV U 135