Not all composers have their works cataloged in Opus numbers.  Remember the case of Haydn’s Hoboken numbers? In Mozart’s works, the most complete and successful chronological catalogue of his compositions was made by Ludwig von Köchel, a 19^th-century Austrian musicologist.

1. Allegro Moderato– 0:00

2. Andante Cantabile – 6:59

3. Allegretto– Allegretto – 14:15