“Haydn - Allegro from Sonata in G” is a short one-page Classical keyboard piece in G major. The music is marked Allegro and uses a bright 3/8 meter, giving the piece a quick, light dance-like character. Its simple right-hand melody, steady left-hand support, repeat-style structure, and D.C. al Fine marking make it a compact early Classical repertoire piece with clear phrasing and form.

Measures 1–5 present the opening section. The right hand carries a lively melody with small stepwise figures and repeated rhythmic shapes, while the left hand supports with simple bass notes and harmony. The forte opening gives the piece a confident beginning, and the Fine marking shows where the piece will end after the da capo return.

Measures 6–12 create the contrasting middle section. The dynamic changes to piano, and the melody continues in a lighter style while the left hand keeps the accompaniment clear and steady. This section gives the short piece a softer answer to the stronger opening material.

Measures 13–16 close the second section and send the performer back with D.C. al Fine. The music returns to a stronger sound and prepares the repeat of the opening material. After the D.C. return, the piece ends at the Fine in measure 5, giving the miniature a rounded Classical form.

Interesting fact: Haydn wrote many keyboard sonatas and short movements that helped define the clean phrase structure and balanced form of the Classical style. Even in a small Allegro like this, the music shows his gift for clear motives, simple contrast, and compact formal design.