The masked stranger, the mysterious commission; the dying Mozart frantically composing as his life ebbs away… If you’ve seen Amadeus, you’ll know the legend behind Mozart’s unfinished Requiem.

For once, though, the reality is even more incredible than the myth – as music’s greatest genius comes to terms with the ultimate mystery of human existence. Mozart finds sorrow, courage and deep compassion, then pours it all out in music of unforgettable beauty and power.

Understandably, any performance is something of an occasion; it’s one of those masterpieces that you simply have to hear live, and today at Cadogan Hall the Royal Philharmonic Orchestra is joined by the glorious voices of the City of London Choir – one of the capital’s longest-established (and most respected) non-professional choruses.