At the Drop of a Hat is a musical revue by Flanders and Swann, described by them as "an after-dinner farrago". In the show, they both sang on a nearly bare stage, accompanied by Swann on the piano. The songs were linked by contemporary social commentary, mostly by Flanders. After a long London run the show played in the US, Switzerland, and on tour in Britain. Background Michael Flanders and Donald Swann had performed together as schoolboys, collaborating in 1940 on a revue at Westminster School. They later collaborated on writing songs for revues, performed by such artists as Max Adrian, Elsie and Doris Waters, Ian Carmichael and Joyce Grenfell. They also wrote songs for Ian Wallace, some of which he recorded on the LP "Wallace's Private Zoo". As successful songwriters they were invited to lecture on the subject at Dartington International Summer School in 1956. Flanders found that his spoken introductions were as well received by the audience as the songs themselves. He and Swann decided to give a show along similar lines in London. They approached Frederick Piffard, manager of the New Lindsey Theatre, a fringe venue seating about 150 people, outside the London West End theatre district, and played him some of their numbers. Swann recalled: "Nice songs", said Freddie Piffard, "but who's in it?" "Us," we said timidly. "Well, you pay the rent," he said, "it's up to you." The show opened on 31 December 1956 at the New Lindsey. No West End shows were opening on that evening, and consequently, as Swann put it, "quite a number of critics turned up on spec." In The Observer, Kenneth Tynan called the show "a witty and educated diversion … Mr. Swann, bent over his piano like a small mad scientist agog over some wild experiment, ideally complements the bearded suavity of Mr. Flanders, who exudes from his wheelchair the robust authority of him who came to dinner." Other notices were equally good, the box-office did excellent business, and the show transferred to the Fortune Theatre in the West End on 24 January 1957, where, according to The Times, "it took the audience by storm". It ran for 808 performances at the Fortune until 2 May 1959. On 8 October 1959 the show opened in New York at the John Golden Theatre, running there for 215 performances. In the New York Herald Tribune Walter Kerr wrote, "Whatever it