Domine, labia mea aperies: et os meum annuntiabit laudem tuam.
I listened to it on Youtube. How different from my experience with Psalms. When the rabbi asks the congregation to say a kapitel of tehillim, the room responds with a kind of a buzzing hum, muttering inmates in an asylum.
I'd like to think that if the Levites did sing Psalms in the holy Temple, it sounded more like this, a truly Divine harmony: