> An octave is an interval of seven notes A is the 8th note after A. Look at it like a short fence. 7 gaps but 8 posts If they'd called it a septave there'd be an argument about that. How would you define "decave" rather than "decade" ? Semantics, etymology and tradition,. that's just the way it is Joe ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4745 / Virus Database: 4007/8059 - Release Date: 08/18/14 --=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 .