Yesterday I made a little canon – an instrument inspired by Cris Foster’s book Musical Mathematics that is used to explore musical relationships. I built it rather cheaply; A wine box from Chile, 3/4″ aluminum angle stock, $1 piece of hard wood, 9 zither pins @ $ 0.28 each from Experimental Musical Instruments, 9 electric guitar strings – all low E 0.046 dia. and a $2 (or less?) bag of 1″ angle brackets. So I used it for a piece made for the ImprovFriday drone theme event which used my DIY 9 string canon, DIY electrified 8 string psaltery, viola bow, ebow, and fingers. The tuning in unknown – just something I did by ear.