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On the Feast of Saint Cecilia in the Roman Rite. For other legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject).  

“I saw the Lord sitting on a throne that towered high above me, the skirts of his robe filling the temple. Above it rose the figures of the seraphim… And ever the same cry passed between them, Holy, holy, holy is the Lord God of hosts; all the earth is full of his glory. The lintels over the doors rang with the sound of that cry, and smoke went up, filling the temple courts.” (Isaiah 6:1-4)