It is a musical rhythm.

When rhythm and blues (R&B) emerged in the mid-1940s, it didn't even have a name. But as soon as the word appeared, it spread quickly and widely. Today, R&B has become synonymous with black pop music, although it is regarded more as a type of music that is different from rap, soul, and urban by special audiences and Mentioned by people in the recording industry. Early rock music was based on R&B, which was an extension of "country and western music" influenced by pop music. R&B is not only an important transitional music between blues and rock music, it is also the most important musical branch between blues and soul.