↑ Reginald Smith Brindle, The New Music, Oxford University Press, 1987, pp 42-3 ↑ Reginald Smith Brindle, The New Music, Oxford University Press, 1987, Chapter 6 passim ↑ "Eric - Math and Music: Harmonious Connections". ↑ Reginald Smith Brindle, The New Music, Oxford University Press, 1987, p 42 ↑ Purwins, Hendrik (2005).