 When notating music, Carrillo used a staff.However, instead of using lines to signify different notes, he used the lines to distinguish between octaves so that each line on the staff represents a different octave.For example, if 0 on the second line of the staff denoted what conventional music terms middle C, 0 on the third line would refer to C an octave higher, and 0 on the first line would refer to C an octave lower.