Question: String Quartet No. 14 is the one of a series of seventeen works in the medium by which Brazilian composer, written in 1953, who was described as "the single most significant creative figure in 20th-century Brazilian art music"?

Documents:
source: String Quartet No. 14 (Villa-Lobos)
text: String Quartet No. 14 (Villa-Lobos) String Quartet No. 14 is the one of a series of seventeen works in the medium by the Brazilian composer Heitor Villa-Lobos, and was written in 1953. A performance lasts approximately seventeen minutes.

source: Heitor Villa-Lobos
text: Heitor Villa-Lobos Heitor Villa-Lobos (] ; March 5, 1887November 17, 1959) was a Brazilian composer, described as "the single most significant creative figure in 20th-century Brazilian art music". Villa-Lobos has become the best-known South American composer of all time. A prolific composer, he wrote numerous orchestral, chamber, instrumental and vocal works, totaling over 2000 works by his death in 1959. His music was influenced by both Brazilian folk music and by stylistic elements from the European classical tradition, as exemplified by his "Bachianas Brasileiras" (Brazilian Bachian-pieces). His Etudes for guitar (1929) were dedicated to Andrés Segovia while his 5 Preludes (1940) were dedicated to Arminda Neves d’Almeida, a.k.a. "Mindinha", both are important works in the guitar repertory.

source: String Quartet No. 7 (Villa-Lobos)
text: String Quartet No. 7 (Villa-Lobos) String Quartet No. 7 is the seventh of seventeen works in the medium by the Brazilian composer Heitor Villa-Lobos, written in 1942. With a performance lasting approximately 37 minutes, it is the longest of Villa-Lobos’s string quartets

source: String Quartet No. 6 (Villa-Lobos)
text: String Quartet No. 6 (Villa-Lobos) String Quartet No. 6 ("Brazilian") is one of seventeen works in the medium by the Brazilian composer Heitor Villa-Lobos, and was written in 1938. A performance lasts approximately 24 minutes.

source: String Quartet No. 10 (Villa-Lobos)
text: String Quartet No. 10 (Villa-Lobos) String Quartet No. 10 is one of a series of seventeen works in the medium by the Brazilian composer Heitor Villa-Lobos, and was written in 1946. A performance lasts approximately 23 minutes.

source: String Quartet No. 2 (Villa-Lobos)
text: String Quartet No. 2 (Villa-Lobos) String Quartet No. 2 is the one of a series of seventeen works in the medium by the Brazilian composer Heitor Villa-Lobos, and was written in 1915. A performance lasts approximately twenty minutes.

source: String Quartet No. 11 (Villa-Lobos)
text: String Quartet No. 11 (Villa-Lobos) String Quartet No. 11 is the one of a series of seventeen works in the medium by the Brazilian composer Heitor Villa-Lobos, and was written in 1947. A performance lasts approximately 27 minutes.

source: String Quartet No. 15 (Villa-Lobos)
text: String Quartet No. 15 (Villa-Lobos) String Quartet No. 15 is one of a series of seventeen works in the medium by the Brazilian composer Heitor Villa-Lobos, and was written in 1954. A performance lasts approximately nineteen minutes.

source: String Quartet No. 13 (Villa-Lobos)
text: String Quartet No. 13 (Villa-Lobos) String Quartet No. 13 is one of a series of seventeen works in the medium by the Brazilian composer Heitor Villa-Lobos, and was written in 1951. A performance of it lasts approximately twenty minutes.

source: String Quartet No. 3 (Villa-Lobos)
text: String Quartet No. 3 (Villa-Lobos) String Quartet No. 3 ("Quarteto de pipocas"—"Popcorn" Quartet) is the third of seventeen works in the medium by the Brazilian composer Heitor Villa-Lobos, and was written in 1916. A performance lasts approximately twenty-three minutes.

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Answer: Heitor Villa-Lobos