[1] Keller's published chamber music suggests associations in London with John Shore and other musicians.
[1] Keller's major work was A Compleat Method for attaining to Play a Thorough Bass (1707).
It was the second work printed in England on musical theory, the first being by Matthew Locke.
François-Joseph Fétis mentions another edition a Rules or a Compleat Method for attaining to Play a Thorough Bass, London, no date.
The Method was revised and by William Holder, and published as an appendix to his own Treatise on Harmony, London, 1731.