The division of a bicade - as I shall now call it - into twelve intervals grouped into seven notes of two different sizes is the method favoured by European musicians of the last three centuries. It is not the only system, and, indeed, many other systems are/were used by other cultures and at other times. So, apart from being illogical, the word octave is very politically incorrect favouring, as it does, the world's dominant culture. Hence my use of the word bicade which, like decade, is a scientifically derived word= .. __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .