To mark their join birthdays last Saturday, Playbill has come up with a novel thought. What if SS and ALW had collaborated on shows? They might have written:

A Little Night Opera
A series of interwoven love affairs occur during one eventful weekend backstage at the Paris Opera. Amongst the lovers are aging opera diva Christine Armfeldt, and her disfigured former beau Erik Egerman.

Anyone Can Sing and Dance
In act one, nurse Emma Apple moves to New York to start a new life at the local asylum. In act two, told entirely through dance, Nurse Apple’s lovers uncovers a hoax being perpetrated by the corrupt mayor.

Aspects of Frogs
Dionysus, in despair about the state of the world, travels to Hades to retrieve George Bernard Shaw, where he discovers that Shaw and Shakespeare have been involved in a romantic entanglement with his deceased wife Ariadne.

Follies Express
A group of retired trains reunite one final time before Penn Station is torn down.

A Funny Thing Happened on the Way to Argentina
Ché schemes to win freedom from enslavement by helping general Juan Perón win the love of Eva Duarte, who is betrothed to singer Agustín Magaldi

Madame Rose Superstar
A rock opera depicting the life of Rose Hovick, as seen through the eyes of her daughter Gypsy Rose Lee.

Merrily Jeeves Rolls Along
The story of how butler Jeeves is driven to madness by his employer Bertie Wooster. The musical unfolds backwards, beginning with Wooster’s drunken toast to Jeeves at his retirement party.

Passion Boulevard
A young writer has a passionate affair with the beautiful, married Clara Schaefer, until he is sent to an old mansion in Hollywood, where he is seduced by sickly former movie star Fosca Desmond.

Sunday in the Park With Cats
A chronicle of the lives of painter Georges Seurat and poet T.S. Eliot as they create their respective masterpieces, “Sunday on the Island of La Grande Jatte” and “Old Possum’s Book of Practical Cats.”

Sweeney Todd and the Amazing Technicolour Dreamcoat
A tailor who was unjustly enslaved by a corrupt Pharaoh returns to Egypt bent on revenge. With the help of Mrs. Lovett, he hatches a revenge plot involving turning Egyptians into matzoh.

You can read the piece and see the programme/Playbill covers at http://www.playbill.com/multimedia/gallery/6318/PHOTO-SPECIAL-Playbill-Dreams-Up-10-Stephen-Sondheim-Andrew-Lloyd-Webber-Collaborations