Question: Which Spanish classical guitarist and composer is acclaimed for the popular opera "Telemachus on Calypso's Island."
Context: The Nokia tune (also called Grande Valse) is a phrase from a composition for solo guitar, Gran Vals, by the Spanish classical guitarist and composer Francisco Tárrega, written in 1902.  It has been the icon of Finnish corporation Nokia since the 1990s, becoming the first identifiable musical ringtone on a mobile phone, and has become a cult classic. Xavier Coll is a Spanish classical guitarist.  In 1989, he formed the classical, flute-guitar duo with Monserrat Gascón.  He also played in a group with Pedro Javier González, Yoshimi Otani and Alex Garrobé.  He has most recently performed with the Barcelona Guitar Trio, along with Luis Robisco and Manuel Gonzalez. Regino Sáinz de la Maza y Ruiz (7 September 1896 – 26 November 1981) was a Spanish classical guitarist and composer. Julián Arcas (1832 – 16 February 1882) was a Spanish classical guitarist and composer, who influenced Francisco Tárrega and Antonio de Torres. Télémaque et Calypso ("Telemachus and Calypso"), also Télémaque or [French: "ou"] Calypso, is an opera by the French composer André Cardinal Destouches, first performed at the Académie Royale de Musique (the Paris Opera) on 29 November 1714.  It takes the form of a "tragédie en musique" in a prologue and five acts. Fernando Sor or Josep Ferran Sorts i Muntades (baptized 14 February 1778 – died 10 July 1839) was a Spanish classical guitarist and composer.  While he is best known for his guitar compositions, he also composed music for a wide range of genres, including opera, orchestra, string quartet, piano, voice, and ballet.  His ballet score "Cendrillon" ("Cinderella") received over one hundred performances.  Sor's works for guitar range from pieces for beginning players to advanced players such as "Variations on a Theme of Mozart".  Sor's contemporaries considered him to be the best guitarist in the world, and his works for guitar have been widely played and reprinted since his death.  Although modern classical guitar players usually do, Sor rarely used his ring finger and refused the usage of nails when playing. Antonio Membrado (21 March 1935 – 3 December 2016) is a Spanish classical guitarist and composer resident in France since 1959.  He was a student of Andrés Segovia and gave many concerts in France and abroad. Andrés Segovia Torres, 1st Marquis of Salobreña (] ) (21 February 18932 June 1987), known as Andrés Segovia, was a virtuoso Spanish classical guitarist from Linares, Spain.  He is regarded as one of the greatest guitarists of all time and the grandfather of the classical guitar.  Many professional classical guitarists today are students of Segovia, or students of his students. Dionisio Aguado y García (8 April 178429 December 1849) was a Spanish classical guitarist and composer of the Classical period. Il Telemaco nell'isola di Calipso ("Telemachus on Calypso's Island") is an opera by composer Fernando Sor.  The libretto was by Carlo Sigismondo Capece.  It was first produced in Barcelona at the Teatro de la San Cruz on 25 August 1797.  It was revived in the same city on 18 May 1798.
Answer: Fernando Sor