Question: What Austrian-born composer and conductor wrote a show in which Cyril Ritchard appeared with Peter Graves?

Context articles: Sigh No More (musical)
Cyril Ritchard
Moose Charlap
Symphony in Two Flats
Aladdin (1958 film)
Dangerous Medicine
Erich Wolfgang Korngold
Blackmail (1929 film)
Yes, Uncle!
Edmund Meisel

Sigh No More is a musical revue consisting of twenty-two scenes and numbers composed, written and produced by Noël Coward, with additional items by Joyce Grenfell, Richard Addinsell and Norman Hackforth.
 The show was Coward's first post-World War II musical and starred Cyril Ritchard, his wife Madge Elliott and Joyce Grenfell.
 It also featured Graham Payn, Coward's longtime partner, who sang the best-known song in the show, the wistful "Matelot".
Cyril Ritchard (1 December 1898 – 18 December 1977) was an Australian stage, screen and television actor, and director.
 He is probably best remembered today for his performance as Captain Hook in the Mary Martin musical production of "Peter Pan".
 In 1945, he played Gabriele Eisenstein in "Gay Rosalinda" at the Palace theatre in London, a version of Strauss's "Die Fledermaus" by Erich Wolfgang Korngold in which he appeared with Peter Graves.
 The show was conducted by Richard Tauber and ran for almost a year.
Mark "Moose" Charlap (December 19, 1928 – July 8, 1974) was an American Broadway composer best known for "Peter Pan" (1954), for which Carolyn Leigh wrote the lyrics.
 The idea for the show came from Jerome Robbins, who planned to have a few songs by Charlap and Leigh.
 It evolved into a full musical, with additional songs by Jule Styne and Betty Comden and Adolph Green.
 On Broadway, starred Mary Martin as Peter Pan and Cyril Ritchard as Captain Hook.
Symphony in Two Flats is a 1930 British drama film directed by Gareth Gundrey and starring Ivor Novello, Benita Hume, Jacqueline Logan and Cyril Ritchard.
 It was an adaptation of a play written by Novello.
 Separate versions were made for the United Kingdom and United States releases, with Jacqueline Logan replacing Benita Hume in the American version.
Aladdin is a 1958 musical fantasy written especially for television with a book by S.J. Perelman and music and lyrics by Cole Porter, telecast in color on the "DuPont Show of the Month" by CBS.
 It was Porter's very last musical score.
 Columbia Records issued both monophonic and stereophonic LP's of the songs with members of the original TV cast, which included Cyril Ritchard, Dennis King, Basil Rathbone, Anna Maria Alberghetti, Geoffrey Holder (as the Genie), Sal Mineo (as Aladdin,) and Una Merkel (as Aladdin's mother).
 Sony Records has digitally remastered the stereo recording for release on CD.
Dangerous Medicine is a 1938 British crime film, directed by Arthur B. Woods and starring Elizabeth Allan and Cyril Ritchard.
 It is now classed as a lost film.
Erich Wolfgang Korngold (May 29, 1897 – November 29, 1957) was an Austrian-born composer and conductor.
 A child prodigy, he became one of the most important and influential composers in the history of Hollywood.
 He was a noted pianist and composer of classical music, along with music for Hollywood films, and the first composer of international stature to write Hollywood scores.
Blackmail is a 1929 British thriller drama film directed by Alfred Hitchcock and starring Anny Ondra, John Longden, and Cyril Ritchard.
 Based on the 1928 play of the same name by Charles Bennett, the film is about a London woman who is blackmailed after killing a man who tries to rape her.
Yes, Uncle!
 is a musical comedy by Austen Hurgen and George Arthurs, with music by Nat D. Ayer and lyrics by Clifford Grey (who also wrote "The Bing Boys are Here" and the following series of highly successful reviews).
 The story is based on the farce "Le truc du Brésilien" by Nicolas Nancey and Paul Armont, and the musical takes its title from the catch-phrase used by Bobby Summers and Mabel Mannering, addressing Uncle Brabazon Hollybone.
 It was produced by George Grossmith, Jr. and Edward Laurillard and opened at the Prince of Wales Theatre in London on 16 December 1917 and ran for a very successful 626 performances.
 The piece starred Fred Leslie as G.B. Stark, Margaret Bannerman as Joan and Leslie Henson as Bobby Summers.
 Later, Madge Elliott and Cyril Ritchard starred in the musical.
Edmund Meisel (14 August 1894 – 14 November 1930) was an Austrian-born composer.
 He wrote the score to Walter Ruttmann's "" (1927), "The Battleship Potemkin" (1925), and other films of Sergei Eisenstein.
 Meisel was one of the more important and pioneering figures in film music.
 Much of his work and the evidence of his significance was lost for more than fifty years.