Jean Baptiste Loeillet of Ghent (1688- c.1720) was a Flemish composer. Often confused with his cousin, Jean-Baptiste Loeillet of London, he spent most of his life in France in the service of the Archbishop of Lyon.

This piece of music started out as a sonata for solo recorder with basso continuo (a bass line with chords added, often performed on a viol or cello plus a lute or harpsichord). Loeillet wrote 48 sonatas for recorder and basso continuo that have survived to this day. Some of these later appeared as anonymous arrangements for two recorders, printed by the London publishers Walsh & Hare in the early 1700s.

The complete sonata is included here:

• I Adagio, which you can play along with on a modern alto recorder (pitched at 440) or on a Baroque alto (pitched at 415)
• II Allegro, which you can play along with at a slower speed or at a faster one, on a modern alto recorder (pitched at 440) or on a Baroque alto (pitched at 415)
• III Adagio, recorded for 415 alto
• IV Giga, Allegro, which you can play along with at a slower speed or at a faster one, both recorded for 415 alto

(Challenging; Adagio – quarter note=50, Allegro, slow version – quarter note=54; Allegro, faster version – quarter note=78; Adagio – half note=54; Giga, slow version – dotted quarter note=62; Giga, up to speed version – dotted quarter note=84)