A rhythm section is the musicians in a popular music band or ensemble who establish the rhythmic pulse of a song or musical piece, and who lay down the chordal structure.

• 节奏组是指在爵士乐或者流行音乐乐队或乐团中为歌曲或乐曲搭建节奏节拍的音乐家集合。如果称其使用的乐器则为节奏乐器组。