Question: What member of the Scriblerus Club also wrote an opera in which music was arranged by Johann Christoph Pepusch?
Context: Frederic Austin (30 March 187210 April 1952) was an English baritone singer, a musical teacher and composer in the period 1905–30.  He is best remembered for his restoration and production of "The Beggar's Opera" by John Gay and Johann Christoph Pepusch, and its sequel, "Polly", in 1920–23.  Austin was the older brother of the composer Ernest Austin (1874–1947). Félix Rienth (born 24 June 1970) is a Swiss operatic tenor.  Born in Basel, he was a member of the Basel Boys Choir in his youth.  He made his first opera appearance as a boy with Theater Basel as the first boy in Wolfgang Amadeus Mozart's "The Magic Flute".  He attended the University of Basel where he earned diplomas in the Spanish and German languages.  He then studied singing privately in Basel with Heidi Wölnerhanssen before entering the Hochschule der Künste Bern; graduating from there in 2000 with a degree in opera performance.  He has since had a major career as a concert singer in the oratorio repertoire; appearing with important ensembles and at major music festivals throughout Europe, including a recital in presence of Her Majesty, Queen Fabiola of Belgium.  He has made about 20 recordings on a variety of labels.  A highly acclaimed production was the recording of Johann Christoph Pepusch]]'s "Tenor Cantatas" with his wife, Muriel Rochat Rienth, recorder player, and Swiss baroque ensemble "La Tempesta Basel".  His CD of Spanish baroque songs "Tonos humanos" by José Marín was considered as a reference recording by German magazine "Klassik heute".  2014 is appearing Georg Philipp Telemann's "Tenor Cantatas" with "La Tempesta Basel", elected among "Best CDs of the month" by Spanish magazine RITMO. Polly is a ballad opera with text by John Gay and music by Johann Christoph Pepusch.  It is a sequel to Gay's "The Beggar's Opera".  Due to censorship, the opera was not performed in Gay's lifetime.  It had its world premiere on 19 June 1777 at the Haymarket Theatre in London.  A revised and edited version of the score by Clifford Bax and Frederic Austin premiered on 30 December 1922 at the Kingsway Theatre in London. The Scriblerus Club was an informal association of authors, based in London, that came together in the early 18th century.  They were prominent figures in the Augustan Age of English letters.  The nucleus of the club included the satirists Jonathan Swift and Alexander Pope.  Other members were John Gay, John Arbuthnot, Henry St. John and Thomas Parnell.  The group was founded in 1714 and lasted until the death of the founders, finally ending in 1745.  Pope and Swift are the two members whose reputations and work have the most long-lasting influence.  Working collaboratively, the group created the persona of Martinus Scriblerus, through whose writings they accomplished their satirical aims.  Very little of this material, however, was published until the 1740s.  Robert Harley, 1st Earl of Oxford and Mortimer occasionally joined the club for meetings, though he is not known to have contributed to their literary output.  The club began as an effort to satirize the abuses of learning wherever they might be found, which led to "The Memoirs of Martinus Scriblerus".  The second edition of Pope's "The Dunciad" also contains work attributed to Martinus Scriblerus. John Gay ( ; 30 June 1685 – 4 December 1732) was an English poet and dramatist and member of the Scriblerus Club.  He is best remembered for "The Beggar's Opera" (1728), a ballad opera.  The characters, including Captain Macheath and Polly Peachum, became household names. John Travers (ca. 1703 – June 1758) was an English composer who held the office of Organist to the Chapel Royal from 1737 to 1758.  Before filling several parochial posts in London he had been a choir boy at St. George's Chapel, Windsor and a pupil of Johann Christoph Pepusch. Johann Christoph Fugger (1561-1612) was a German businessman and the last famous survivor of the Fugger vom Reh branch of the Fugger family.  He was employed at the royal court in Prague.  In 1603 he married Regina Greiner.  Johann Christoph was a member of the German nobility.  His grandfather, Gastel Fugger, got a patent of nobility in 1547.  Johann Christoph Fugger had no descendants.  Contemporary members of the Fugger vom Reh are descendants of Matthäus Fugger (1442-1489/92).  The current patriarch is Markus Fugger von dem Rech (born 1970). The Royal Society of Musicians of Great Britain is a charity in the United Kingdom that supports musicians.  It is the oldest music-related charity in Great Britain, founded in 1738 as the "Fund for Decay'd Musicians" by a declaration of trust signed by 228 musicians, including Edward Purcell (eldest son of Henry Purcell), Thomas Arne, William Boyce, Johann Christoph Pepusch, Dr. John Worgan, and George Frideric Handel.  It still operates a bank account at Drummonds Bank (now part of Royal Bank of Scotland) which was opened by its first secretary, Michael Christian Festing, in November 1738. Johann Christoph Pepusch (1667 – 20 July 1752), also known as John Christopher Pepusch and Dr Pepusch, was a German-born composer who spent most of his working life in England. The Beggar's Opera is a ballad opera in three acts written in 1728 by John Gay with music arranged by Johann Christoph Pepusch.  It is one of the watershed plays in Augustan drama and is the only example of the once thriving genre of satirical ballad opera to remain popular today.  Ballad operas were satiric musical plays that used some of the conventions of opera, but without recitative.  The lyrics of the airs in the piece are set to popular broadsheet ballads, opera arias, church hymns and folk tunes of the time.
Answer: John Gay