Shakespeare was not a full-time writer without other responsibilities, like O’Neill or Williams. But what might look like a distraction for such authors—acting in his own and other people’s plays, coaching fellow players, helping manage the ownership of the troupe’s resources (including its two theaters, the Globe and Blackfriars)—was a strength for Shakespeare, since it made him a day-by-day observer of what the troupe could accomplish, actor by actor. [...]Shakespeare and Verdi in the Theater.
'According to Pacini,' Julian Budden writes in The Operas of Verdi, 'it was the custom at the San Carlo theatre, Naples, for the composer to turn the pages for the leading cello and double bass players on opening nights.' The composer had to change his score to fit new voices if there were substitutions caused by illness or some other accident. In subsequent performances, he was expected to take out or put in arias for the different houses, transposing keys, changing orchestration. He was not a man of the study but of the theater.