Trumpet used for Proclaiming Kings
Source: TTT
2 Kings 9:13
Quickly, each man took his garment and put it under Jehu on the bare steps. Then they blew the ram’s horn and proclaimed, “Jehu is king!”
2 Kings 11:14
And she looked out and saw the king standing by the pillar, according to the custom. The officers and trumpeters were beside the king, and all the people of the land were rejoicing and blowing trumpets. Then Athaliah tore her clothes and screamed, “Treason! Treason!”