• German Baroque
• Music and death
• Alchemy and counterpoint
• Imagination
• Musical invention
• Elizabethans
• The Italian keyboard traditions of the seventeenth century
• Handel's operas
• The film scores of Bernard Hermann
• Improvisation from the age of Antonio Cabezon to that of Dexter Gordon

Books:

• Bach and the Meanings of Counterpoint. Cambridge University Press, 2002.
  

Selected Articles:

• "Death Everyday: the Anna Magdalena Bach Book of 1725 and the Art of Dying," in Eighteenth-Century Music (forthcoming 2005).
• "The Concerto in the Age of J. S. Bach," Cambridge Companion to the Concerto, ed. Simon Keefe. Cambridge University Press, forthcoming 2005.
• "C. P. E. Bach and the Living Traditions of Eighteenth-Century Counterpoint," in C. P. E. Bach Studies, ed. Annette Richards. Cambridge University Press, forthcoming 2005.
• "The Musical Patriots of the Hamburg Opera: Mattheson, Keiser, and Masaniello furioso," in Patriotism, Cosmpolitanism, and National Culture: Public Culture in Hamburg, 1700-2000, ed. Peter Hohendahl. Amsterdam: Rodopi, 2003.
• "The Awkward Idiom: Hand-crossing and the European Keyboard Scene around 1730," in Early Music (May 2002).
• "An Ideal Organ and its Experts Across the Seventeenth Century," in The Organ as a Mirror of its Time, ed. Kerala Snyder. Oxford University Press, 2002.
• "Alchemy and Canon in an Age of Reason," in Journal of the American Musicological Society (Summer 1998); translated as "Alchemie und Kontrapunkt im 'Zeitalter der Venunft,'" in Antike Weisheit und kulturelle Praxis: Hermetismus als Kulturphänomen in der frühen Neuzeit, ed. Anne-Charlott Trepp and Hartmut Lehmann. Göttingen: Vandenhoeck & Ruprecht, 2001.
• "Toward an Allegorical Interpretation of Buxtehude's Funerary Counterpoints," in Music and Letters (January 2000).
• "Stylus Phantasticus and the New Musical Imagination," in GOArt Research Reports, vol. 1, ed. Sverker Jullander (Göteborg, 2000).
• "J. S. Bach," in Cambridge Companion to the Organ, ed. Geoffrey Webber and Nicholas Thistlethwaite. Cambridge University Press, 1998.

Performances (2005):

• Norden, Ludgerikirche, Norden, Germany, July 2005: works by Bull, Purcell, Greene, Blow, Handel.
  
• Dresden, Hofkirche, Dresden, Germany, June 2005: works by Bach, Handel, and Scarlatti.
• Treviso International Organ Festival, May 2005: works by Bull, Philips, and Byrd.
• Wiesbaden, Kirche des Erlösers, Wiesbaden, Germany, February 2005: works by Buxtehude, Böhm, Bach.

Selected Recordings:

• The Great Contest: Bach, Scarlatti, Handel, Loft Recordings (2002).
• In Dialogue, with Robert Bates, Loft Recordings (2001).
• Music of a Father and Son: Organ Works of Delphin and Nicolaus Adam Strungk, Loft Recordings (1999).

• European music culture of the seventeenth and eighteenth centuries, with particular emphasis on the music of Bach and Handel.
• Music theory
• Jazz
• Film music
• Active as a studio teacher of organ, harpsichord and clavichord.