Tallis: Spem in Alium (The Tallis Scholars)
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Fifty Shades Of Grey - The Classical Album: a guide

6. Tallis: Spem in Alium (The Tallis Scholars)
This choral epic, here performed by the Tallis Scholars, was composed in 1570 for eight choirs of five voices each. It produces a particularly haunting effect, with each different vocal part gradually combining and falling away at various points to create a transcendental listening experience.