Question: Which American composer of short, light concert pieces and supported by John Williams wrote Blue Tango?

Context paragraphs:
Horn Concerto (Williams): John Williams's Concerto for Horn and Orchestra is a solo composition for horn with orchestra accompaniment.  Williams wrote the piece for principal horn player Dale Clevenger of the Chicago Symphony Orchestra in 2003 on a commission from the Edward F. Schmidt Family Commissioning Fund.  The premiere performance took place on November 29, 2003.  The work is technically demanding of the performer, and Williams himself described it as a symphonic poem that explores a variety of colors and moods.

Leroy Anderson: Leroy Anderson ( ~ ); (June 29, 1908 – May 18, 1975) was an American composer of short, light concert pieces, many of which were introduced by the Boston Pops Orchestra under the direction of Arthur Fiedler.  John Williams described him as "one of the great American masters of light orchestral music."

David (1951 film): David is a short film made in 1951 about the Welsh miner and poet David Rees Griffiths.  It was directed by Paul Dickson, who also wrote the script, shot by Ronald Anscombe, produced by James Carr, and distributed by Regent Films.  Leading Welsh composer Grace Williams wrote the score for the film.  The film is 38 minutes long and was given a U certificate.  It was the Welsh contribution to the Festival of Britain film festival.

Frank Lee Sprague: Frank Lee Sprague, born in Wichita Falls, Texas, is a US guitarist and composer.  He writes both songs and concert pieces.  His catalog numbers over 1000 works, including two string quartets, three symphonies, many chamber music compositions, and two operas.

Mary Lou Williams: Mary Lou Williams (born Mary Elfrieda Scruggs; May 8, 1910 – May 28, 1981) was an American jazz pianist, composer, and vocalist.  She wrote hundreds of compositions and arrangements, and recorded more than one hundred records (in 78, 45, and LP versions).  Williams wrote and arranged for such bandleaders as Duke Ellington and Benny Goodman, and she was friend, mentor, and teacher to Thelonious Monk, Charlie Parker, Miles Davis, Tadd Dameron, Bud Powell, Dizzy Gillespie, and many others.

When God Comes and Gathers His Jewels: "When God Comes and Gathers His Jewels" is a hymn written by Hank Williams.  It was the B-side to his second single, "Wealth Won't Save Your Soul," released in 1947 on Sterling Records.  Williams wrote and performed spiritual music throughout his career on his radio shows and in concert, usually closing personal appearances with his famous gospel number "I Saw the Light."  He recorded this song on December 11, 1946 at WSM Studios in Nashville with Fred Rose producing and was backed on the session by the Willis Brothers, who also went by the name of the Oklahoma Wranglers: James "Guy" Willis (guitar), Vic Wallis (accordion), Charles "Skeeter" Willis (fiddle), and Charles "Indian" Wright (bass).

Blue Tango: "Blue Tango" is an instrumental composition by Leroy Anderson, written in 1951 and published in 1952.  It was later turned into a popular song with lyrics by Mitchell Parish.  Numerous artists have since covered "Blue Tango".

The Little Island: The Little Island is a 1958 British animated short film directed by Richard Williams.  It was Williams' first film.  Williams wrote, produced, directed and animated the short film.  Self-financed, it was a half-hour philosophical argument without words.  It won the 1958 BAFTA award for Animated Film.

Delores S. Williams: Delores S. Williams is a theologian notable for her formative role in the development of womanist theology and best known for her book "Sisters in the Wilderness".  Her writings over the years have discussed the role intersecting oppressions of race, gender, and class have played in the situation of black women.  As opposed to feminist theology as it was predominately practiced by white women and black theology as predominately practiced by black men, Williams argues that black women's oppression deepens the analysis of oppression in theology.  In "Sisters in the Wilderness," Williams' primarily develops a rereading of the biblical figure, Hagar, to illuminate the importance of issues of reproduction and surrogacy in black women's oppression.  According to Aaron McEmrys, "Williams offers a theological response to the defilement of black women... Womanism is an approach to ethics, theology and life rooted in the experiences of African-American women".  The term "Womanism" was coined by a contemporary of Williams, Alice Walker, used in her 1979 short story "Coming Apart" and again in her 1983 essay collection "In Search of Our Mothers' Gardens".  Williams wrote the eighth chapter of "Transforming the Faiths of our Fathers: Women who Changed American Religion" (2004), edited by Ann Braude.

Reynaldo Young: Reynaldo Young [b. 1966] is a London-based Uruguayan composer, arranger, guitarist, teacher and workshop leader.  He has written concert pieces as well as music for dance, theatre, and video – many of them performed worldwide; he is also an active player at the free improvisation scene around Europe and the United Kingdom.

Supporting paragraphs: Blue Tango Leroy Anderson
Answer: Leroy Anderson