Williams, William
Six sonata’s in three parts; three for two violins and three for two flutes, with a part for the base-violin or viol, and a figur’d base for the organ, harpsicord or arch-lute.
London, Thomas Cross, for the author
John Hare, John Walsh
The obligato bass part (called base-violin or viol in the title, violone in the separate part) differs only in short passages from the b. c.
A/I: W 1172, https://opac.rism.info/search?id=990068593&View=rism