Singing songs of the oecumene—the whole inhabited earth—is rooted in the feast of Pentecost, portrayed in the book of Acts, when people from the whole known world gathered in Jerusalem and heard the disciples singing of God’s glorious acts in many tongues.
Now, as then, we are assured that we are surrounded by the unseen host of the saints of God, who in countless tongues sing with us the unending song of praise.