Riffs and Variations on a Single Note for Jelly Roll, Earl Hines, Louis Armstrong, Baby Dodds... - Each circle represents the prevalence of notes in each song. Each song was run through a music frequency analysis program that visualized the frequencies being played and what note they correspond to. The percentage of the song that each note was being played was calculated and graphed on a circle containing 100 concentric circles, each representing 1%. The highest note, B8, is located at the top. As you move clockwise the note gets lower until is reaches C2 back at the top.