Listen to Tchaikovsky: Variations on a Rococo Theme, Op. 33: Theme. Moderato semplice online. Tchaikovsky: Variations on a Rococo Theme, Op. 33: Theme. Moderato semplice is an Unknown language song and is sung by Mstislav Rostropovich, Berliner Philharmoniker and Herbert Von Karajan. Tchaikovsky: Variations on a Rococo Theme, Op. 33: Theme. Moderato semplice, from the album Reading Goethe, was released in the year 2020. The duration of the song is 1:42. Download Unknown songs online from JioSaavn.