Hire a professional singer to demonstrate your choral parts.
Real vocal teach tracks help you learn the lyrics whilst following the musical directions given in the score.
What are they?

Teach Tracks
Recorded demonstrations make learning so easy.
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Full Mix
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Part Predominant
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Part Panned L/R
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Part Missing
What's included?
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Sheet music - you must provide this
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Copyright licence - do not sell or copy without obtaining