《礼记·乐记》
然后才有圣人出来，制成靴、鼓、控、褐、壤、挽，这六种乐器，是能够发出德音的乐器。
然后，圣人作为鼗、鼓、椌、楬、埙、篪，此六者德音之音也。
Then the sages came forward and made six kinds of musical instruments: the boot, the drum, the flute, the bowstring, the gong, and the pull. These instruments were capable of producing virtuous sounds.