The eight chord sequences. (IMAGE) University of Tokyo Caption These are the eight chord sequences which were generated using a mathematical model, based on U.S. Billboard songs. Credit 2024 Daikoku, Tanaka and Yamawaki/ iScience Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.