Original sentence: Redir Rhythm
Edited sentence: (ibid, p.3-4) distinguishes nine time scales of music:.Curtis Roads (2001, p.Examples such as sound installations in which the order of the sound is determined by, for example, a listeners movement through the system, are thus placed in time.ISBN 0-262-18215-7.In music, a time scale is specification of divisions (scale) of time or rhythm.Infinite: literally infinite, such as the length of sine waves in classical Fourier analysis,.Infinitesimal: literally "infinitely brief" such as delta functions.Macro: "overall musical architecture or form" or the level of the individual piece; minutes, hours, or even days,.Meso: "Divisions of form" including movements, sections, phrases; seconds and minutes,.Micro: "sound particles" (see granular synthesis) down to the threshold of audible perception; thousands to millionths of seconds,.Music may, however, exist "outside" of time when structured through "principles whose definitions does not imply a temporal order", including scales and many other precompositional techniques, musical instruments, and aleatoric music.Roads, Curtis (2001).Sample: sample (music), measured as are samples in millionths of a second or microseconds,.Sound object (Schaeffer 1959, 1977): "a basic unit of musical structure" and a generalization of note (Xenakis' ministructural time scale); fraction of a second to several seconds,.Subsample: changes "too brief to properly recorded or perceived", billionths of a second, nanosecond, or less, and.Supra: months, years, decades, and centuries; everything above the level of