Listen to Serenade for Strings in C Major, Op. 48: II. Waltz. Moderato online. Serenade for Strings in C Major, Op. 48: II. Waltz. Moderato is an Instrumental language song and is sung by The World Symphony Orchestra and Leopold Ostrov. Serenade for Strings in C Major, Op. 48: II. Waltz. Moderato, from the album The Masterpieces - Tchaikovsky: Serenade for Strings in C Major, Op. 48, was released in the year 2011. The duration of the song is 3:42. Download Instrumental songs online from JioSaavn.