Question: Which opera has more acts, Einstein on the Beach or Owen Wingrave?
Context: David Myerscough-Jones FCSD (15 September 1934 – 21 April 2010) was an English film, television, and theatre production designer.  He spent the majority of his career with BBC TV, as well as in the theatre and opera production companies.  He worked with the British composer Benjamin Britten on "Peter Grimes" (1969 Snape Maltings, Aldeburgh), "Owen Wingrave" (1970 BBC TV World Premier, Snape Maltings), and "Die Winteriesse" (1970 Britten Piano, Peter Pears Tenor). Einstein on the Beach is an opera in four acts (framed and connected by five "knee plays" or intermezzos), composed by Philip Glass and directed by theatrical producer Robert Wilson.  The opera eschews traditional narrative in favor of a formalist approach based on structured spaces laid out by Wilson in a series of storyboards.  The music was written "in the spring, summer and fall of 1975."  Glass recounts the collaborative process: "I put [Wilson’s notebook of sketches] on the piano and composed each section like a portrait of the drawing before me.  The score was begun in the spring of 1975 and completed by the following November, and those drawings were before me all the time."  The premiere took place on July 25, 1976, at the Avignon Festival in France.  The opera contains writings by Christopher Knowles, Samuel M. Johnson and Lucinda Childs.  It is Glass's first and longest opera score, taking approximately five hours in full performance without intermission; given the length, the audience is permitted to enter and leave as desired. Curlew River – A Parable for Church Performance (Op. 71) is an English music drama with music by Benjamin Britten to a libretto by William Plomer.  The first of Britten's three 'Parables for Church Performance', the work is based on the Japanese "noh" play "Sumidagawa" (Sumida River) of Juro Motomasa] (1395–1431), which Britten saw during a visit to Japan and the Far East in early 1956.  Beyond the "noh" source dramatic material, Britten incorporated elements of "noh" treatment of theatrical time into this composition.  "Curlew River" marked a departure in style for the remainder of the composer's creative life, paving the way for such works as "Owen Wingrave", "Death in Venice", and the Third String Quartet. Owen Wingrave, Op.  85, is an opera (originally written for a televised performance) in two acts with music by Benjamin Britten.  The libretto is by Myfanwy Piper, after a short story by Henry James. Victor Michael Milenski (born 1941) founded the Long Beach Opera in 1979, and was its general director for 25 seasons, retiring in 2004.  Though local opera companies had been organized in the 1920s and 1960s in metropolitan Los Angeles, under Milenski’s direction the Long Beach Opera became the first professional opera company to take root in the modern era and survive.  Having predated the formation of Los Angeles Opera and Orange County's Opera Pacific, Long Beach Opera is the Los Angeles area's oldest standing professional opera company. Sylvia Fisher (18 April 191025 August 1996) was an Australian operatic soprano whose stage career was made in England, who was especially distinguished in German opera, and who created the role of Miss Wingrave in Benjamin Britten's "Owen Wingrave" in 1971. Schloss Einstein is a long-running, popular German television series which is designed as a teenage soap opera.  It portrays the lives of teenagers in Schloss Einstein (Castle Einstein), a fictional boarding school.  The intended audience is 10- to 14-year-olds. Christopher Knowles (born 1959) is an American poet and painter.  He was born in New York City and has received a diagnosis of possible brain damage.  He is often referred to as autistic.  In 1976, his poetry was used by Robert Wilson for the avant-garde minimalist Philip Glass opera, "Einstein on the Beach".  Wilson describes his discovery of the then 13-year-old Knowles in the extended notes to the Tomato Records release of "Einstein on the Beach": Michael Chioldi (born May 24, 1970) is an American operatic baritone who has performed at many major American opera houses and festivals, including the Metropolitan Opera, San Francisco Opera, Washington National Opera, Houston Grand Opera, San Diego Opera, Santa Fe Opera, Los Angeles Opera, Palm Beach Opera, Long Beach Opera, Minnesota Opera, Spoleto Festival USA, Arizona Opera, Utah Opera, New York City Opera, Fort Worth Opera, Chautauqua Opera, Kentucky Opera, Glimmerglass Opera, Hawaii Opera Theatre, Santa Fe Concert Association, Lyric Opera of Kansas City, Chicago Opera Theatre, Austin Lyric Opera, New Orleans Opera, Odyssey Opera, Michigan Opera Theatre and Vermont Opera Project. "Einstein on the Beach (For an Eggman)" is a song recorded by Counting Crows from the album "DGC Rarities Vol.  1".  It was included on the band's best-of compilation, "Films About Ghosts (The Best Of...)".  The title of the song was inspired by the Philip Glass opera "Einstein on the Beach."  The song became the band's first number one song on the Modern Rock chart, beating their previous highest-charting single, "Mr. Jones" which reached number two.  However, "Mr. Jones" stayed longer on the Modern Rock chart and became an enduring pop hit, whereas "Einstein" failed to achieve the same success.
Answer: Einstein on the Beach