Last Sunday (Passion Sunday) we had a total electricity failure in Holy Trinity. No lights, no microphones, no organ. Nothing. But our choir rose magnificently to the occasion. They sang the hymns in good strong SATB harmony throughout. They improvised harmonies for the worship songs. And the anthem -- Purcell's "Thou knowest, Lord, the secrets of our hearts" -- sounded great. (Pastor Paul also did very well with no mic.) Many said afterwards how moving it was to hear the choir lead worship without any organ "interference".
In some Christian traditions there is a beautiful old custom of reducing music to its simplest -- just voices -- during Lent. They did that in Bach's Leipzig until the time of the Good Friday Passion. Some suggested we should try that in HT next year. Well, we'll see. But while some folk think we should have DJs in church, and others think they need recorded music, for me the power of unaccompanied voices is something I love more and more. What better to proclaim God's praises than the voices of people made in his image?