When Yu the Great was ruling China, like Yao, feared that he might be not good at everything. He wanted to encourage people to give him suggestions.
He set different instruments for people to raise different types of concerns. If someone wants to teach Yu knowledge, they can hit the drum; if someone wants to teach Yu how to behave, they can knock the bell; if someone has some worries, they can hit the chime stone; if someone thinks there is injustice, they can swing the rings.
This is more specific than what Yao did in Jian Gu Bang Mu.