Siu-Lan Tan is Associate Professor of Psychology at Kalamazoo College in Michigan USA. She graduated in Music Education and Piano Pedagogy and taught music for many years in Hong Kong and California before completing an M.A. and Ph.D. in Psychology at Georgetown University. Her research has focused on musical unity, music notation, and film music, and her primary instrument is piano.Peter Pfordresher is Associate Professor of Psychology at SUNY Buffalo in New York USA. He completed his Ph.D. in Psychology at the Ohio State University. His research interests include the role of auditory feedback in music performance and causes of inaccurate singing. He has experience in musical performance… with piano, trumpet, and voice, as well as song writing.Rom Harré is Emeritus Fellow of Linacre College, Oxford University. Currently he is Distinguished Research Professor of Psychology at Georgetown University, and Director of the Centre for the Philosophy of the Natural and Social Sciences at the London School of Economics. He has performed in various amateur ensembles on clarinet and saron.