Excessive vibrato in choirs is often the sign of a weak conductor. I've heard countless choirs where banks of singers warble away, oscillating their vibrato a quarter tone in either direction, but all doing it at different times. Result: an underlying musical cacophony which obscures the lines and produces a sound which the composer certainly didn't write in his manuscript. A good conductor would put a stop to it, if necessary by coaching each section or sub-section individually, and telling the ringleaders to 'put sock in it' (and firing them if they won't). But sopranos, in particular, at full warble can be intimidating, especially if they’re the musical director’s wife or related to the chief financial patron. So they're often permitted to yodel like Swiss peasants and wreck countless performances. It’s not good. Audiences shouldn’t tolerate it.
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