The "r" in R&b Music

This page is the CodyCross answer for the clue below from Amusement Park, Group 220, Puzzle 1 (House of Mirrors).

Question is: The "r" in R&b Music

and the answer is: RHYTHM

Word Meaning:

RHYTHM — The variation of strong and weak elements (such as duration, accent) of sounds, notably in speech or music, over time; a beat or meter.

Definitions from Wiktionary.

The "R" in R&B music — CodyCross Answer | CodyCross Solutions