Listen to Piano Sonata No. 16 in C Major, K. 545 "Sonata facile": I. Allegro online. Piano Sonata No. 16 in C Major, K. 545 "Sonata facile": I. Allegro is an Instrumental language song and is sung by Walter Klien. Piano Sonata No. 16 in C Major, K. 545 "Sonata facile": I. Allegro, from the album 111 Piano Masterpieces, was released in the year 2010. The duration of the song is 2:54. Download Instrumental songs online from JioSaavn.