Question: Who wrote the Dragon King the third of the four music dramas?

Context paragraphs:
Dragon King: The Dragon King, also known as the Dragon God, is a Chinese water and weather god.  He is regarded as the dispenser of rain as well as the zoomorphic representation of the "yang" masculine power of generation.  He is the collective personification of the ancient concept of the "lóng" in Chinese culture.  He can take a variety of forms, the most important ones being the cosmological Sìhǎi Lóngwáng (四海龍王 "Dragon Kings of the Four Seas") who, with the addition of the Yellow Dragon (黃龍 "Huánglóng") of Xuanyuan, represent the watery and chthonic forces presided over by the Five Forms of the Highest Deity (五方上帝 "Wǔfāng Shàngdì"), or their zoomorphic incarnation.  One of his epithets is Dragon King of Wells and Springs.

Siegfried (opera): Siegfried, WWV 86C, is the third of the four music dramas that constitute "Der Ring des Nibelungen" ("The Ring of the Nibelung"), by Richard Wagner.  It premiered at the Bayreuth Festspielhaus on 16 August 1876, as part of the first complete performance of "The Ring" cycle.

Druk Gyalpo: The Druk Gyalpo (འབྲུག་རྒྱལ་པོ་ ; lit. " Dragon King" or the King of Bhutan) is the head of state of the Kingdom of Bhutan.  In the Dzongkha language, Bhutan is known as "Drukyul" which translates as "The Land of Dragons".  Thus, while Kings of Bhutan are known as "Druk Gyalpo" ("Dragon King"), the Bhutanese people call themselves the "Drukpa", meaning "Dragon people".

Joust (novel): First commissioned for "the dragon quintet" edited by Marvin Kaye, "Joust" appeared as a short story along with "In the Dragon's House" by Orson Scott Card, "Judgment" by Elizabeth Moon, "Love in a time of Dragons" by Tanith Lee and "Dragon King" by Michael Swanwick.

Heilongdawang Temple: The Heilongdawang Temple (literally Temple of the Great Black Dragon King) is a prominent Chinese folk religion/Shenist temple located in Shanbei, Shaanxi province, in China.  The temple enshrines the Black Dragon King with the imperially conferred title of Marquis of the Efficacious Response (灵应侯, "Lingyinghou").  Dragon kings (龙王, "longwang") are water deities popular in droughty Northern China.

Whitney Houston videography: The videography of American pop/R&B recording artist Whitney Houston consists of fifty-five music videos, four music video compilations, a concert tour video and three music video singles.  In 1983, Houston signed a recording contract with Arista Records and two years after released her eponymous debut album.  Houston's first music video was for the single "You Give Good Love", which was selected to establish her in the black marketplace first.  In the video of worldwide hit "Saving All My Love for You", she played a beaming All-American girl shadowed by her secret lover's wife.  The following video "How Will I Know", directed by Brian Grant, that helped introduce the singer to a wider audience when it became one of the first videos by a black female singer to earn heavy rotation on MTV, blasting open the doors for a whole generation of R&B and pop divas to follow.  The clip won MTV Video Music Award for Best Female Video at its 3rd ceremony of 1986. " Greatest Love of All", the final single released from Houston's debut album, which helped cement the M.O. for the classic Whitney video.  In June 1986, Houston released her first video compilation "The No. 1 Video Hits", containing her four music videos off the "Whitney Houston" album.  The video compilation reached number-one on the "Billboard" Top Music Videocassettes chart and stayed at the top spot for 22 weeks, which remains the all-time record for a video collection by a female artist, and was certified Platinum for shipments of 100,000 units by the Recording Industry Association of America (RIAA) on July 15, 1986.  In 1987, "I Wanna Dance with Somebody (Who Loves Me)", the first single from her second album "Whitney", was one of Houston's most recognized music videos in company with the song's smash hit worldwide.  Houston's fashion and hairstyle in the clip―towering curly wig, colorful dangly earrings and a series of going-to-the-club outfits―became one of her iconic looks.

Götterdämmerung: Götterdämmerung ( ; Twilight of the Gods), WWV 86D, is the last in Richard Wagner's cycle of four music dramas titled "Der Ring des Nibelungen " ("The Ring of the Nibelung", or "The Ring" for short).  It received its premiere at the Bayreuth Festspielhaus on 17 August 1876, as part of the first complete performance of the "Ring".

Dark Kingdom: The Dragon King: Dark Kingdom: The Dragon King (also known as "Ring of the Nibelungs", "Die Nibelungen"," Curse of the Ring" and "Sword of Xanten") is a 2004 German television film directed by Uli Edel and starring Benno Fürmann, Alicia Witt, Kristanna Loken and Max von Sydow.  The film is based on the Norse mythology story "Völsungasaga" and the German epic poem "Nibelungenlied", which tells the mythological story of Siegfried the Dragon-Slayer.  Richard Wagner's music dramas "Siegfried" and "Götterdämmerung" are based on the same material.  "Dark Kingdom: The Dragon King" was written by the husband and wife team of Diane Duane and Peter Morwood and is a Tandem Communications production.  It was filmed entirely in South Africa.

Das Rheingold: Das Rheingold ( ; The Rhinegold), WWV 86A, is the first of the four music dramas that constitute Richard Wagner's "Der Ring des Nibelungen," or in English, 'The Ring of the Nibelung'.

Prince Nezha's Triumph Against Dragon King: Prince Nezha's Triumph Against Dragon King (, and also known as "Nezha Conquers the Dragon King") is a 1979 Chinese animated film.  It was screened out of competition at the 1980 Cannes Film Festival.

Supporting paragraphs: Dark Kingdom: The Dragon King Siegfried (opera)
Answer: Richard Wagner