Given my comment-heavy Psalm-singing entry a couple months ago, I wanted to pass on a couple examples of great Psalms sung corporately. These videos are not of trained musicians but of congregations who have toiled to learn how to sing Psalms in four-part harmony (and some difficult ones at that!). Also, it’s from a church-wide Psalm sing, not an actual worship service. Great stuff, passed on from DWils.
From Psalm 119 (Psalm 119X in the Psalter):
Psalm 98: (Psalm 98A in the Psalter):