As OnCovered is about music and how graphics actually can create music, we took as a starting point an alternative note system, developed by Karlheinz Stockhausen in 1973, and developed for it a grid, which is based upon the "Romain du Roi" designed in 1704 by Greandjean. The system we obtained is very flexible. It could produce thousands of different recordsleeves, loud ones, silent ones and very surprising ones. We are very happy about about the possibilities this system has.