Listen to Piano Sonata No. 1 in C Major, K. 279: I. Allegro online. Piano Sonata No. 1 in C Major, K. 279: I. Allegro is an English language song and is sung by The Best Relaxing Music Academy. Piano Sonata No. 1 in C Major, K. 279: I. Allegro, from the album Relax with Soothing Classical Melodies, was released in the year 2018. The duration of the song is 2:34. Download English songs online from JioSaavn.