How we made: Peter Shaffer and Felicity Kendal on Amadeus
'At first, when they heard how childish and foul-mouthed Mozart was, the cast got the giggles''I came up with the idea for this play after reading a lot about Mozart. I was struck by the contrast between the sublimity of his music and the vulgar buffoonery of his letters. I am often criticised for portraying him as an imbecile, but I was actually conveying his childlike side: his letters read like something written b…