The Rhythmic reference article from the English Wikipedia on 24-Jul-2004
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Rhythmic

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Rhythmic music and Rhythmic radio, also known as "Rhythmic Crossover" or "Rhythmic Pop", is a term used to describe a certain group of radio stations and the Billboard chart that is compiled based on airplay from those radio stations.

Rhythmic radio stations generally play a mixture of pop, R&B, hip hop, and dance music. A Rhthmic station's playlist would probably include: Christina Aguilera, Outkast, Dirty Vegas, Usher, Madonna, Jennifer Lopez, Ja Rule, Britney Spears, Kylie Minogue, and Justin Timberlake, among others.