What does 1 Chronicles 15:18 mean?

Their relatives Zechariah, Jaaziel, Shemiramoth, Jehiel, Unni, Eliab, Benaiah, Maaseiah, Mattithiah, Eliphelehu, Mikneiah, Obed-Edom, and Jeiel were chosen as assistants for the singers. 1 Chronicles 15:18 - Modern Text Bible

(A large team supports the main leaders, making the music a group effort and involving many people in the celebration.)