swinsian

swinsian, wk.v: to make a (pleasing) sound, make melody or music. (“sween-see-on”)

musician

Musician from the Gradual of Saint-Etienne of Toulouse.France, S. (Toulouse), last quarter of the 11th century or first quarter of the 12th century. British Library, Harley MS 4951, f. 297v. [bl.uk]