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a canon is a contrapuntal composition that employs a melody with one or more imitations of the melody played after a given duration.
A simple canon (like this sonata) imitates the leader perfectly at the unison.
George Philip Telemann
canonic sonata op. 5 n. 3 in D maj.
1. Spirituoso
2. Larghetto
3. Allegro assai
flute: Alessandro Palazzani