Bible Verses About Trumpet: Proclaiming kings

At this, they hurried each one to take his cloak and put it under Yehu at the top of the stairs. Then they blew the shofar and proclaimed, "Yehu is king!"

looked and saw the king standing there on the platform, in keeping with the rule, with the leaders and trumpeters next to the king. All the people of the land were celebrating and blowing the trumpets. At this 'Atalyah tore her clothes and cried, "Treason! Treason!"