Allegri : Miserere (Psalm 50). Tallis Scholars.

Allegri: Miserere.
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http://youtu.be/YDOENZediM8.

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Psalm 51 (Greek/Catholic numbering: Psalm 50), traditionally referred to as the Miserere, its Latin incipit, is one of the Penitential Psalms.

It begins: "Have mercy on me, O God". The Psalm's opening words in Latin, Miserere mei, Deus, have led to its being called the Miserere Mei or even just Miserere. It is often known by this name in musical settings. The Psalm is frequently used in various Liturgical traditions because of its spirit of humility and repentance.