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Welcome to the Chartmasters website. This site is dedicated to popular music and the popularity rankings of songs detailed in the Chartmasters’ publication ROCK 100.

The authors of ROCK 100, Jim Quirin and Barry Cohen, added a new dimension to popular music rankings with their development of the Cumulative Popularity Index, or CPI, in 1974. Though many people have utilized simplified ranking techniques for years, Jim and Barry combined their knowledge of the record charts with the application of the principles of mathematics to develop the most sophisticated and accurate methodology available today.

Their mathematical algorithm and its development have been included (by permission) in numerous mathematics textbooks, demonstrating the soundness of the authors’ theories and the practical application of the basic principles of calculus.

All Billlboard® chart data which appears in our publications and on this site is Copyright © by Billboard Publications, Inc. and used by permission.

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