The Andante cantabile from Mozart’s Sonata No. 10 in C major, K. 330, is a quiet F-major movement with a contrasting F-minor middle section. A short pickup leads into a singing right-hand melody, supported by chords, held inner notes, and a bass line that moves independently beneath it. Turns and small decorative figures enrich the tune without making it continuously busy. The opening material returns after the minor-key contrast, followed by a gentle closing passage.

The first section combines a turn in the upper melody with descending eighth notes and small answering gestures. Some notes remain held while another voice moves around them, and the bass occasionally enters away from the main beat. Short slurs, accents, and changes between softer and stronger dynamics shape the phrases. The opening portion repeats, then continues into a second passage with a wider melodic range, chromatic notes, and more active exchanges between the hands. This passage also has a repeat.

The middle section changes to a four-flat key signature and an F-minor sound. Its opening melody uses short, low chordal gestures followed by longer dotted notes. The left hand introduces repeated sixteenths, creating a persistent pulse beneath the more sustained upper part. Stronger chordal responses and quiet answers interrupt that texture. Both parts of this contrasting section are repeated before a short closing passage prepares the return.

When F major comes back, the principal melody is written out again, with familiar turns and descending shapes. The continuation includes altered decoration and small changes in the accompaniment. The last passage recalls the repeated-note texture heard in the middle section, now underneath major-key chords. The dynamics remain quiet, and the movement ends with a simple pianissimo cadence.

Interesting fact: The repeated-note accompaniment does not belong only to the F-minor middle section. It returns near the end under F-major harmony, connecting the movement’s contrasting sounds within the quiet close.