Listen to Symphony No. 1 in C Major, Op. 21: I. Adagio molto - Allegro con brio online. Symphony No. 1 in C Major, Op. 21: I. Adagio molto - Allegro con brio is an Instrumental language song and is sung by Daniel Barenboim. Symphony No. 1 in C Major, Op. 21: I. Adagio molto - Allegro con brio, from the album Beethoven: The Nine Symphonies, Leonore Overture & Overture from Fidelio, was released in the year 2000. The duration of the song is 8:56. Download Instrumental songs online from JioSaavn.