ROBERT L MARSHALL is the Louis, Frances, and Jeffery Sachar Professor Emeritus of Music at Brandeis University. DAVID SCHULENBERG has performed on historical keyboard instruments across North America, Europe and Asia, and has recorded for Naxos, Hungaroton, and Brilliant Classics. His publications include The Music of Carl Philipp Emanuel Bach (University of Rochester Press, 2014). He has taught at Boston University, the Juilliard School, and the University of North Carolina at Chapel Hill, where he directed the Collegium Musicum. His website schulenbergmusic.org features numerous recordings and editions. JULIAN RUSHTON is Emeritus Professor of Music, University of Leeds, UK. ROBERT L MARSHALL is the Louis, Frances, and Jeffery Sachar Professor Emeritus of Music at Brandeis University.