David Beard is Senior Lecturer in Music at Cardiff University, UK. He has published widely in peer-reviewed journals, including Cambridge Opera Journal, Music Analysis, and Twentieth-Century Music, and is the author of Harrison Birtwistle's Operas and Music Theatre (2012). He co-edited Harrison Birtwistle Studies (2015) and has contributed chapters to Ancient Drama in Music for the Modern Stage (2010) and Peter Maxwell Davies Studies (2009). He sits on the editorial board of the journal Music & Letters.

Kenneth Gloag is Professor of Music at Cardiff University, UK. His publications include books on Tippett's A Child of Our Time (1999) and Nicolas Maw's Odyssey (2008). He is author of Postmodernism in Music (2012), and has co-edited and contributed chapters to Peter Maxwell Davies Studies (2009), The Cambridge Companion to Michael Tippett (2013), and Harrison Birtwistle Studies (2015). He was inaugural reviews editor of the journal Twentieth-Century Music (2004-12).