Tuning and temperament : closing the spiral / Neil Bibby -- Musical cosmology : Kepler and his readers / J. V. Field -- Science of musical sound / Charles Taylor -- Faggot's fretful fiasco / Ian Stewart -- Helmholtz : combinational tones and consonance / David Fowler -- Geometry of music / Wilfrid Hodges -- Ringing the changes : bells and mathematics / Dermot Roaf and Arthur White -- Composing with numbers : sets, rows and magic squares / Jonathan Cross -- Microtones and projective planes / Carlton Gamer and Robin Wilson -- Composing with fractals / Robert Sherlaw Johnson.