Sex - as well as politics, spying, social revolution and the Cold War.
"Stephen Ward" centers on a sensational real-life scandal, the 1963 revelation that Britain's war secretary, John Profumo, was involved with model Christine Keeler, who was also sleeping with a Soviet naval attache.
The "Profumo affair" rattled Britain's establishment and fascinated the nation.
But Lloyd Webber says the show, which opens in London in December, is about more than the scandal - it's a portrait of a "febrile time" of tumultuous social change.
At a preview of songs from the musical Monday, the "Phantom of the Opera" composer said, "It's just extraordinary, really, the ramifications of what went on."