Operationalizing variables and rap statistics: The Web site Rap Genius analyzes rap music using what they call RapMetrics

(http://rapgenius.com/posts/63-Introducing-rapmetricstm-the-birth-ofstatistical-analysis-of-rap-lyrics). It has developed a measure called rhyme density, which is the proportion of all syllables that are part of the rhyme.

Eminem’s Without Me, for example, has a rhyme density of 0.49 (49%)

because almost half of the lyrics are part of the rhyme, whereas Notorious B.I.G.’s Juicy only has a rhyme density of 0.23 (23%). The people behind Rap Genius say, “Over the course of a career, the rappers with the highest rhyme densities are basically the best technical rappers.”