Keith Potter is Reader in Music at Goldsmiths, University of London, where he is currently Director of Postgraduate Research in Music. His many publications covering various areas of contemporary music have particularly emphasized British and American work. The author of Four Musical Minimalists: La Monte Young, Terry Riley, Steve Reich, Philip Glass (2000), he was the co-founder and, for seventeen years, the Chief Editor of Contact: a journal of contemporary music, and also for ten years a regular music critic on The Independent daily newspaper. From 2007 he has been a founding committee member of the Society for Minimalist Music and is presently its Chair. Kyle Gann is a composer and was new-music critic for the Village Voice from 1986 to 2005. Since 1997 he has taught at Bard College. He is the author of The Music of Conlon Nancarrow; American Music in the 20th Century; Music Downtown: Writings from the Village Voice; No Such Thing as Silence: John Cage's 4'33"; Robert Ashley (University of Illinois Press, 2012), and the introduction to the 50th anniversary edition of Cage's Silence (Wesleyan University Press, 2011). Gann studied composition with Ben Johnston, Morton Feldman, and Peter Gena. His research into postminimalist music has been generously supported by the National Endowment for the Humanities. Pwyll ap Siôn is senior lecturer at Bangor University, Wales. His monograph on The Music of Michael Nyman was published by Ashgate Publishing in 2007. He has recently edited Michael Nyman's collected writings for publication. As composer, he has written for bass-baritone Bryn Terfel, soprano Elin Manahan Thomas, the European Union Chamber Orchestra and the BBC National Orchestra of Wales. He writes regularly for Gramophone magazine.