Trumpet used for Blowing Over the Sacrifices on the Feast Day
Source: TTT
Numbers 10:10
And on your joyous occasions, your appointed feasts, and the beginning of each month, you are to blow the trumpets over your burnt offerings and fellowship offerings to serve as a reminder for you before your God. I am the LORD your God.”
Psalm 81:3
Sound the ram’s horn at the New Moon, and at the full moon on the day of our Feast.