Listen to Les Sylphides: Waltz in G Flat Major, Op. Posth. 70 No. 1 (Orch. Douglas) online. Les Sylphides: Waltz in G Flat Major, Op. Posth. 70 No. 1 (Orch. Douglas) is an Instrumental language song and is sung by Robert Irving and Philharmonia Orchestra. Les Sylphides: Waltz in G Flat Major, Op. Posth. 70 No. 1 (Orch. Douglas), from the album Chopin Ballets, was released in the year 2011. The duration of the song is 2:05. Download Instrumental songs online from JioSaavn.