Information for Mozart from Scratch at Royal Albert Hall, Inner London (Concert). Mozart's Requiem is one of the most popular of all choral works, with an intriguing history to add mystery to the music: Mozart, already a sick man, had illusions that he was writing the Requiem for himself! As many as 2,000 singers from The Really Big Chorus will perform this astonishingly powerful piece, full of fervour and passion. The Really Big Chorus is proud to be supporting the Royal Society of Musicians at this concert. All proceeds from programme sales, sponsorship and advertising will be channelled to this charity, the oldest of Britain's musical charities of which Handel was a founder supporter.