A COMPUTATIONAL MODEL FOR RULE-BASED MICROTONAL MUSIC THEORIES AND COMPOSITION TORSTEN ANDERS AND EDUARDO R. MIRANDA MOTIVATION ICROTONAL MUSIC is an influential facet of twentieth and 21st cen- tury music composition. Composers that contributed significantly to microtonal music include characters as diverse as Julián Carrillo, Ben Johnston, Harry Partch, Horaţiu Rădulescu, Karlheinz Stock- hausen, James Tenney, Ivan Wyschnegradsky and La Monte Young (in alphabetical order). As microtonal music opens wide areas of uncharted musical territory, computational support can be very helpful for navigating this M