Listen to Impromptus, Op. 90: No. 1 in C Minor (Allegro molto moderato) online. Impromptus, Op. 90: No. 1 in C Minor (Allegro molto moderato) is an English language song and is sung by Alfred Brendel. Impromptus, Op. 90: No. 1 in C Minor (Allegro molto moderato), from the album 25 Schubert Playlist, was released in the year 2014. The duration of the song is 8:31. Download English songs online from JioSaavn.