Listen to Symphony No. 1, Op. 21: I. Adagio molto - Allegro con brio online. Symphony No. 1, Op. 21: I. Adagio molto - Allegro con brio is an English language song and is sung by London Symphony Orchestra. Symphony No. 1, Op. 21: I. Adagio molto - Allegro con brio, from the album Beethoven: Symphonies Nos. 1 & 2, was released in the year 2014. The duration of the song is 8:14. Download English songs online from JioSaavn.