Interestingly, I was glued to this audience of people enjoying themselves and not the concert they were watching. Concerts like this happen all the time outside London's National Theatre. I had just seen A Funny Thing Happened on the Way to the Forum, a musical with music and lyrics by Stephen Sondheim and a book by Burt Shevelove and Larry Gelbart. The plot displays many classic elements of farce, including puns, the slamming of doors, cases of mistaken identity (frequently involving characters disguising themselves as one another), and satirical comments on social class.