Listen to Tchaikovsky: Swan Lake Suite, Op. 20a: I. Scene "Swan Theme". Moderato online. Tchaikovsky: Swan Lake Suite, Op. 20a: I. Scene "Swan Theme". Moderato is an Unknown language song and is sung by Berliner Philharmoniker and Herbert Von Karajan. Tchaikovsky: Swan Lake Suite, Op. 20a: I. Scene "Swan Theme". Moderato, from the album World of Classical Music: Tchaikovsky, was released in the year 2022. The duration of the song is 2:44. Download Unknown songs online from JioSaavn.