About this blogger:
A theorist, organist, and conductor, Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004), and did graduate work in Musicology. He serves as choirmaster for the new FSSP parish in Los Angeles, where he resides with his wife and children.
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The soul is distracted from that which is sung by a chant that is employed for the purpose of giving pleasure. But if the singer chant for the sake of devotion, he pays more attention to what he says, both because he lingers more thereon, and because, as Augustine remarks (Confess. x, 33), “each affection of our spirit, according to its variety, has its own appropriate measure in the voice, and singing, by some hidden correspondence wherewith it is stirred.” The same applies to the hearers, for even if some of them understand not what is sung, yet they understand why it is sung, namely, for God's glory: and this is enough to arouse their devotion.
— St. Thomas Aquinas
A Chabanel Psalm sung A Cappella
published 14 November 2010 by Jeff Ostrowski

A cappella means “in the style of the chapel.” Today, it has come to mean “without accompaniment.” It may not be the best term, however, because sometimes instruments were used in church right along with the voices (in certain countries in certain chapels during certain time periods).

In any event, here is what a Chabanel Psalm sounds like a cappella