including "The Anatomy of Authenticity" (1985) and "How to Judge a Harpsichord" (1985). In October 1987 Hill was "Continuo's" featured artist. Another article was titled "Plastic versus Quill" ("Continuo", 1993). After researching tanning methods and techniques for the making of hammer leather suitable for use on fortepianos, Hill developed a custom hammer leather. Hill began making violins and studying violin varnish in 1978. After five years of experimentation, he developed a varnish made from wood ashes, water (to convert the ash to lye), linseed oil, and rosin. In 1994 he published his findings in an article in the "Guild of American Luthiers Journal" (#37) titled: "Ash Violin Varnish." Further research in 2012-13 led Hill to refine the varnish formula currently in use. Later Hill compiled his knowledge into thirteen acoustical principles, creating a lengthy document, "Treatise on the True Art of Making Musical Instruments—a Practical Guide to the Forgotten Craft of Enhancing Sound". This work has been published. It is used as the text for his Acoustical Technology Training program. Hill has conducted his research in partnership with his wife, Marianne Ploger (Professor of Music Perception and Cognition at Vanderbilt University) and his brother, Robert Hill (Director of the Early Music Program at the Hochschule für Musik Freiburg in Germany). Hill and Ploger jointly re-wrote and revised an earlier article, "On Affect." They have collaborated in presenting a series of workshops on the craft of musical communication at conservatories and schools of music in Europe and the United States. In 2008 Hill established the Acoustical Technology Trainee program that is specific to the technical craft of enhancing sound, not instrument making, and has now taught keyboard instrument acoustics to a number of professional musicians and luthiers: Maxims Doronins, Artiom Sinelnikov, Ladislav Prokop, Devin Golka, Alexander Shchetnya, Alexander Shipanov, Romano Danesi, Fabio Rigali. Hill maintains a violin making workshop in Nashville, Tennessee. Keyboard instruments continue to be made in his Tennessee workshop. Hill's instruments, which are known for their full tone, have been used in performances and recordings by keyboard artists such as Elizabeth Farr (Naxos), Robert Hill (Archive Prod. Hanssler Classics), Mireille Lagace (ATMA, Calliope), Mitzi Meyerson (Dabringhaus & Grimm), Anthony Newman (Vox cum laude), Edward Parmentier (Wildboar), and Andreas Staier] (Archive Prod., Deutsche Harmonia Mundi) and many others.