Adam Gopnik reflects on why musical theatre makes its makers miserable. He should know - he's just finished an eight week run of a musical he wrote.

He concludes that while films, for example, have a "natural author" in the shape of the director, a musical doesn't and "a seven-person creative team of equals", he says can never be harmonious.

But there's a lot of fun to be had along the way....

Producer: Adele Armstrong.