Question: What American composer was recognized by a privately funded foundation that was concevied in 1978?

Context paragraphs:
Keep the Clause campaign: The Keep the Clause campaign was a privately funded political campaign organised in 2000 with the aim of resisting the repeal of legislation known as Clause 28 of the Local Government Act 1988 in Scotland and the United Kingdom, which forbade local authorities to "intentionally promote homosexuality".  (Clause 28 was known as Section 2A of the relevant Scottish legislation).  The campaign involved the first privately funded referendum to take place across Scotland.  The campaign was ultimately unsuccessful.

Google Lunar X Prize: The Google Lunar XPRIZE (GLXP), sometimes referred to as Moon 2.0, is an inducement prize space competition organized by XPRIZE, and sponsored by Google.  The challenge calls for privately funded spaceflight teams to be the first to land a privately funded robotic spacecraft on the Moon, travel 500 meters, and transmit back high-definition video and images.

Wisconsin Institutes for Discovery: The Wisconsin Institutes for Discovery is a public-private biomedical research partnership that is located on the University of Wisconsin–Madison campus.  It consists of two institutions: the privately funded Morgridge Institute for Research, and the publicly funded Wisconsin Institute for Discovery.  Both institutes opened in 2010.  The publicly funded institute is headed by David Krakauer, and the privately funded institute is led by chief executive officer Brad Schwartz.  Jo Handelsman has been appointed as Director of the Wisconsin Institutes for Discovery, effective on February 1, 2017.

Tanoto Foundation: Tanoto Foundation is a privately funded non-profit organisation founded by Indonesian entrepreneur Sukanto Tanoto and his wife Tinah Bingei Tanoto.  The Foundation focuses mainly on poverty alleviation, funding and developing programs aimed at improving access and quality to education, empowering rural and under-privileged communities to be self-sufficient, and enhancing rural quality of life.  The Foundation operates in countries in which Tanoto has business presence.

William Grant Still: William Grant Still (May 11, 1895 – December 3, 1978) was an American composer, who composed more than 150 works, including five symphonies and eight operas.

Mississippi Institute of Arts and Letters: The Mississippi Institute of Arts and Letters (MIAL) is a privately funded foundation created to recognize annually the greatest accomplishments in art, music, literature, and photography among Mississippians.  The idea was conceived by, among others, former Mississippi Governor William Winter, Dr. Cora Norman, Dr. Aubrey Lucas, and Dr. Noel Polk in 1978, and the first awards were given out in 1980.  Nominations for these awards may be made only by registered members of the Institute.  The winners are chosen by a jury of prominent academics in each of the seven fields: Fiction, Non-fiction, Visual Art, Concert Musical Composition, Popular Musical Composition, Photography, and Poetry.  The ceremony is held in a different Mississippi city each year.  Past winners have included Walker Percy, Ellen Douglas, Ellen Gilchrist, Richard Ford, Larry Brown, Rick Bass, Lewis Nordan, Beverly Lowry, Donna Tartt, Clifton Taulbert, Barry Hannah, Willie Morris, Leontyne Price, Cynthia Shearer, Stephen Ambrose, Steve Yarbrough, Tom Franklin, Brad Watson, Shelby Foote, Natasha Trethewey, Birney Imes, Maude Schyler Clay, William Grant Still, Morgan Freeman, Christopher Maurer, Wyatt Waters, Logan Skelton, and many others.  Lifetime achievement awards have been presented to artists such as Gulf Coast painter and potter Walter Anderson, Jackson writer Eudora Welty, and the distinguished film actor from the Delta, Morgan Freeman.

Next Foundation: The NEXT Foundation is a privately funded New Zealand philanthropic foundation that was launched in March 2014.  It has a mandate to invest $100 million over 10 years into environmental and educational projects that will benefit New Zealanders.  NEXT Foundation is aiming to make large-scale commitments of approximately $5–15 million per annum over 10 years to a small number of projects.

Operation USA: Operation USA (also known as OpUSA, Operation California, or OpCal) is a non profit humanitarian organization dedicated to helping communities alleviate the effects of disaster, disease, and endemic poverty throughout the world by providing privately funded relief, reconstruction, humanitarian aid and development aid.  It is exclusively privately funded, receiving no assistance from the United States federal government.  OPUSA had a revenue of over $22 million in fiscal year 2012 and has shipped over $425 million worth of "high-priority medical, nutritional and shelter supplies" since its inception, including shipments to Haiti, Japan, Chile, Kenya and Pakistan in 2011 and 2011.

Claude Moore Colonial Farm: Claude Moore Colonial Farm, originally Turkey Run Farm, is a U.S. park in Virginia recreating and reenacting life on a tenant farm c. 1771.  Turkey Run is the only privately run park in the U.S. National Park Service (NPS).  The Friends of Claude Moore Colonial Farm at Turkey Run Inc., a privately funded foundation, pays for all activities on the farm, while the land is owned by the NPS.  They receive only certain maintenance tasks from the Park Service.  The Farm is located in Langley, Virginia, a suburb of McLean, Virginia, next to the George Bush Center for Intelligence and the Turner-Fairbank Highway Research Center.  Market Fair events are held at the park.

Soyuz TM-30: Soyuz TM-30 (Russian: Союз ТМ-30 , "Union TM-30"), also known as Mir EO-28, was a Soyuz mission, the 39th and final human spaceflight to the Mir space station.  The crew of the mission was sent by MirCorp, a privately funded company, to reactivate and repair the station.  The crew also resupplied the station and boosted the station to an orbit with a low point (perigee) of 360 and a high point (apogee) of 378 kilometers (223 and 235 miles, respectively).  The boost in the station's orbit, which was done by utilizing the engines of the Progress M1-1 and M1-2 spacecraft, made transit between Mir and the International Space Station impossible, as desired by NASA.  The mission was the first privately funded mission to a space station.

Supporting paragraphs: Mississippi Institute of Arts and Letters William Grant Still
Answer: William Grant Still