I find playwriting really painful. I love it, or I wouldn't do it, but I don't love the theater as much as I love movies.
And you know, when you take on something like this, you read a book like this, you know that it's going to be an adventure. That's part of what draws you to it.
Even if it was a difficult operation to copy a song, it only takes one person to do it. After that the spread of the song via the Internet or other means of propagation is only limited by the honesty of the users.