rhythm-and-blues

[rith-uh m-uh n-blooz]
noun
  1. a folk-based but urbanized form of black popular music that is marked by strong, repetitious rhythms and simple melodies and was developed, in a commercialized form, into rock-'n'-roll.

Origin of rhythm-and-blues

An Americanism dating back to 1945–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018