Question: The first production of the Alliance Theatre was a semi-opera with music by whom?

Context paragraphs:
Semi-opera: The terms "semi-opera", "dramatic[k] opera" and "English opera" were all applied to Restoration entertainments that combined spoken plays with masque-like episodes employing singing and dancing characters.  They usually included machines in the manner of the restoration spectacular.  The first examples were the Shakespeare adaptations produced by Thomas Betterton with music by Matthew Locke.  After Locke's death a second flowering produced the semi-operas of Henry Purcell, notably "King Arthur" and "The Fairy-Queen".  Semi-opera received a deathblow when the Lord Chamberlain separately licensed plays without music and the new Italian opera.

Henrietta Valor: Henrietta Valor (April 28, 1935 – November 23, 2007) was an actress and singer who starred on Broadway in, “Jacques Brel is Alive and Well and Living in Paris”.  Other Broadway credits include, “Half a Sixpence”, “Applause”, and “Annie”.  Off-Broadway she played a leading role in “Fashion”, which she reprised twenty years later at The Pasadena Playhouse.  She toured extensively for the USO in Europe, Africa, and the Far East including Viet Nam.  Her regional theatre credits include: The Studio Arena Stage in Buffalo, The Alliance Theatre in Atlanta, A.C.T. in Seattle, The Williamstown Theatre in Mass., PAF Playhouse in Huntington, Long Island, Playwrights Horizons in New York, The Boston Shakespeare Company, and three seasons in the acting company of The Guthrie Theatre in Minneapolis.  She studied opera on scholarship with Lotte Lehmann in Santa Barbara and acting with Alvina Krause at Northwestern University where she received her Bachelor of Music degree.  She was a runner-up in the Metropolitan Opera Auditions in New York City.  Her last acting role was Miss Framer in, “Lettice and Lovage” at The Pasadena Playhouse.

Bethany Anne Lind: Bethany Anne Lind is an American stage and screen actor in Atlanta, Georgia and New York City, New York.  She is best known for creating roles in world premieres such as Margo in "Carapace"" (at Alliance Theatre), Olivia in "26 Miles" (at Alliance Theatre), and Dora in "The Storytelling Ability of a Boy" (at Florida Stage).

Alliance Theatre: The Alliance Theatre is a theater company in Atlanta, Georgia, based at the Alliance Theatre, part of the Robert W. Woodruff Arts Center, and is the winner of the 2007 Regional Theatre Tony Award.  The company, originally the Atlanta Municipal Theatre, staged its first production ("King Arthur") at the Alliance in 1968.  The following year the company became the Alliance Theatre Company.

King Arthur (opera): King Arthur, or The British Worthy (Z. 628), is a semi-opera in five acts with music by Henry Purcell and a

Ghost Brothers of Darkland County: Ghost Brothers of Darkland County is a musical by John Mellencamp, Stephen King, and T Bone Burnett.  It debuted at the Alliance Theatre in Atlanta, Georgia, in 2012.  A touring production began in late 2013 through the South and Midwest.  A soundtrack was released featuring country, folk, and rock musicians.

Lady Day at Emerson's Bar and Grill: Lady Day at Emerson's Bar and Grill is a play with music by Lanie Robertson, recounting some events in the life of Billie Holiday.  The play originally premiered in 1986 at the Alliance Theatre in Atlanta, Georgia, and soon played Off-Broadway.  The play opened on Broadway in 2014.

Chilsag Chillies Theatre Company: Chilsag Chillies is an Indian Theatre company and the flagship LiveShow,Stageplay and musical production arm of the Chisag Entertainment Network.The company has operations in US, UK, Canada and India and has a network of talented artists all over the world.  Chilsag Chillies also maintains a global network of research centers in key cities around the world that provide inputs on the latest in world theatre.Founded in 2003 by Sachin Gupta ,Chilsag Chillies Theatre Company prides itself in being one of the few theatre companies that showcase their own original creations.  Within the short period of its existence, Chilsag Chillies Theatre Company has been able to set a benchmark of success in the field of theatre.  The very first production of the company, “Celebration of Life”, was felicitated by the chief minister of Delhi, Sheila Dikshit and was also appreciated internationally when it was performed at the Factory Theatre, Toronto, Canada and Off-Broadway Theare,New York.  The high standard set by the first production has only been matched, if not surpassed, by the succeeding productions.

Gentrification of Atlanta: The gentrification of Atlanta has been the source of both praise and condemnation.  Gentrification of Atlanta's inner-city neighborhoods began in the 1970s, and it has continued, at varying levels of intensity, into the present.  Many factors have contributed to the city's gentrification.  A major increase in gentrification that occurred in the last years of the twentieth century has been attributed to the 1996 Summer Olympics.  However, during the 2000s, Atlanta underwent a profound transformation demographically, physically, and culturally.  Suburbanization, rising prices, a booming economy, and new migrants decreased the city’s black percentage from a high of 67% in 1990 to 54% in 2010.  From 2000 to 2010, Atlanta gained 22,763 white residents, 5,142 Asian residents, and 3,095 Hispanic residents, while the city’s black population decreased by 31,678.  Much of the city’s demographic change during the decade was driven by young, college-educated professionals: from 2000 to 2009, the three-mile radius surrounding Downtown Atlanta gained 9,722 residents aged 25 to 34 holding at least a four-year degree, an increase of 61%.  Between the mid-1990s and 2010, stimulated by funding from the HOPE VI program, Atlanta demolished nearly all of its public housing, a total of 17,000 units and about 10% of all housing units in the city.  In 2005, the $2.8 billion BeltLine project was adopted, with the stated goals of converting a disused 22-mile freight railroad loop that surrounds the central city into an art-filled multi-use trail and increasing the city’s park space by 40%.  Lastly, Atlanta’s cultural offerings expanded during the 2000s: the High Museum of Art doubled in size; the Alliance Theatre won a Tony Award; and numerous art galleries were established on the once-industrial Westside.

Pearl Cleage: Pearl Cleage (born December 7, 1948) is an African American author whose work, both fiction and non-fiction, has been widely recognized.  Her novel "What Looks Like Crazy on an Ordinary Day" was a 1998 Oprah Book Club selection.  Cleage is known for her feminist views, particularly regarding her identity as an African American woman.  Cleage teaches drama at Spelman College in Atlanta, Georgia and is the Playwright in Residence at the Alliance Theatre.

Supporting paragraphs: Alliance Theatre King Arthur (opera)
Answer: Henry Purcell