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280 pages, Hardcover
First published December 8, 2003
To estimate the relative creative output or "productivity" of sample members, the length in centimeters of the recorded music listings in the Schwann Opus catalogue was measured. This variable is analogous to the citations indexes widely used to measure the productivity of scholars and the value of invention patents. The more music of enduring quality a composer wrote, the more items were likely to survive in recorded form, and hence the longer the Schwann listing. The better any given work was, the more likely it was to be recorded by multiple artists and groups, and so again, the longer the Schwann listing.