Mozart

In the documentary 'What Makes Mozart Tic?' composer James McConnel believed Mozart had Tourette's and channelled it into his symphonies.

The 18th century composer is regarded as one of the greatest in the history of western music, having created more than 600 pieces that are admired for their melodic beauty.

McConnel, 46, said: "He wrote some absolutely disgusting letters and although people in the eighteenth century were pretty crude anyway, he took it to another level.

"He wrote songs with titles such as 'Hung like an ox' or 'Lick out my a*******' which is really just his sense of humour going wrong, as can often happen with people who have Tourette's.

"It's a mixture of chaos and control. Tourette's is a constant battle between the two, having a compulsion and trying to control it, and that translates into music.

"He used a great deal of fugue in his music which is very complicated but was very unfashionable at the time. He lets his music run off in chaotic directions but then always brought it back under control."