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Bach – Sanctus in D major BWV 238 – Van Veldhoven | Netherlands Bach Society
The unusual thing about the Sanctus in D major, performed by the Netherlands Bach Society for All of Bach, is that there are only two independent instrumental parts: the bass part and the first violins. The other instruments double the four-part choir. So the whole work is six-part. This is probably due to the biblical source of the Sanctus, as the book of Isaiah tells of seraphim with ‘six wings’ who sing the Sanctus to one another. – Netherlands Bach Society
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Dispatches from the Asylum 