1 Chronicles 15:16-21

Then David told the chiefs of the Levites to appoint their relatives as the singers, with instruments of music—harps, lyres, and cymbals—to play loudly and to raise sounds of joy [with their voices]. So the Levites appointed Heman the son of Joel, and from his relatives, Asaph the son of Berechiah; and from the sons of Merari their relatives, Ethan the son of Kushaiah, and with them their relatives of the second rank: Zechariah, Ben, Jaaziel, Shemiramoth, Jehiel, Unni, Eliab, Benaiah, Maaseiah, Mattithiah, Eliphelehu, and Mikneiah, Obed-edom, and Jeiel, the gatekeepers. So the singers, Heman, Asaph, and Ethan were appointed to sound aloud the bronze cymbals; and Zechariah, Aziel, Shemiramoth, Jehiel, Unni, Eliab, Maaseiah, and Benaiah [were to play] with harps tuned to Alamoth [that is, a high pitch]; and Mattithiah, Eliphelehu, Mikneiah, Obed-edom, Jeiel, and Azaziah were to lead with lyres set to Sheminith [that is, the eighth string, a low pitch].