'Union' in the Bible

the trumpeters and musicians played in union, praising and giving thanks to the LORD. They praised the LORD loudly and sang, "He is good, and his gracious love is eternal," accompanied by the trumpets, cymbals, and other musical instruments.) As they did this, a cloud filled the Temple, that is, the LORD's Temple,

So I shepherded the flock intended for slaughter, the afflicted of the flock. I took two staffs, calling one Favor and the other Union, and I shepherded the flock.

Then I cut in two my second staff, Union, annulling the brotherhood between Judah and Israel.

But not one has done so who has a remnant of the Spirit. And what did that one do while seeking a godly offspring? Take heed then to your spirit, and let no one deal treacherously against the wife of your youth.