A performance by the Gesualdo Six usually begins with Joseph Wicks, one of the tenors, taking a tuning fork from his pocket and banging his head with it. Wicks has perfect pitch (although how his pitch is any more perfect than the other five is surely lost on the audience as soon as they start to sing). Wicks then hums the note that they need – usually the tonic. And that’s it… In they come – in perfect time and sublime voice, their unison as resonant as it is textured, as nuanced as it is sumptuous, as understated as it is transcendent.

“The hardest thing for us is…

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