Cantate Domino is a short, lightly dancing setting of Psalm 95 cast technically very much in the same mould as the mass, though the key is Bb, with two pairs of voices (S/A, T/B) doubling each other at the octave and four instrumental lines, two of them T-voices, the other two doubling the voices at a higher and lower octave still. Again, in practice, various distributions of voices and instruments can be made. (Paul Hillier, "Arvo Part," Oxford, New York, 1997)