Lohengrin is a character in German Arthurian literature. The son of Parzival (Percival), he is a knight of the Holy Grail sent in a boat pulled by swans to rescue a maiden who can never ask his identity. His story, which first appears in Wolfram von Eschenbach's Parzival, is a version of the Knight of the Swan legend known from a variety of medieval sources. Wolfram's story was expanded in two later romances. In 1848 Richard Wagner adapted the medieval tale into his popular opera Lohengrin.

Lohengrin first appears as "Loherangrin," the son of Parzival and Condwiramurs in Wolfram von Eschenbach's Parzival. Wolfram's story is a variation of the Knight of the Swan tale, previously attached to the Crusade cycle of medieval literature. Loherangrin and his twin brother Kardeiz join their parents in Munsalväsche when Parzival becomes the Grail King; Kardeiz later inherits their father's secular lands, and Loherangrin remains in Munsalväsche as a Grail Knight. Members of this order are sent out in secret to provide lords to kingdoms that have lost their protectors and Loherangrin is eventually called to this duty in Brabant, where the duke has died without a male heir. His daughter Elsa fears the kingdom will be lost, but Loherangrin arrives in a boat pulled by a swan and offers to defend her, though he warns her she must never ask his name. He weds the duchess and serves Brabant for years, but one day Elsa asks the forbidden question. He explains his origin and steps back onto his swan boat, never to return.

Wilhelm Richard Wagner ( /ˈvɑːɡnər/; German pronunciation: [ˈʁiçaʁt ˈvaːɡnɐ]; 22 May 1813 – 13 February 1883) was a German composer, conductor, theatre director and polemicist primarily known for his operas (or "music dramas", as he later called them). Wagner's compositions, particularly those of his later period, are notable for their complex texture, rich harmonies and orchestration, and the elaborate use of leitmotifs: musical themes associated with individual characters, places, ideas or plot elements. Unlike most other opera composers, Wagner wrote both the music and libretto for every one of his stage works. Perhaps the two best-known extracts from his works are the Ride of the Valkyries from the opera Die Walküre, and the Wedding March (Bridal Chorus) from the opera Lohengrin.

Initially establishing his reputation as a composer of works such as The Flying Dutchman and Tannhäuser which were broadly in the romantic vein of Weber and Meyerbeer, Wagner transformed operatic thought through his concept of the Gesamtkunstwerk ("total work of art"). This would achieve the synthesis of all the poetic, visual, musical and dramatic arts and was announced in a series of essays between 1849 and 1852. Wagner realized this concept most fully in the first half of the monumental four-opera cycle Der Ring des Nibelungen. However, his thoughts on the relative importance of music and drama were to change again, and he reintroduced some traditional operatic forms into his last few stage works, including Die Meistersinger von Nürnberg.

Jonas Kaufmann (born 10 July 1969) is a German operatic tenor. Although he has sung a variety of leading roles including both the Mozart and Wagner repertoire, he is particularly known for his performances in spinto roles such as Don José in Carmen, Cavaradossi in Tosca, Maurizio in Adriana Lecouvreur, and the title role in Don Carlos.

Kaufmann was born in Munich. His father worked for an insurance company, and his mother was a kindergarten teacher. He had one older sister. He started studying piano when he was eight, and he sang in his elementary school choir. Although he studied for math entrance exams, in the summer of 1989 he began his vocal training at the University of Music and Performing Arts Munich. While studying, he sang some small roles at the Bavarian State Opera. He graduated from school in 1994.

In 1995, after a vocal crisis, Kaufmann received help from American baritone Michael Rhodes who taught him a "new way of singing" and how to become "more relaxed in my voice and in myself." In Kaufmann's book Meinen die wirklich mich? he said, "To find a Michael Rhodes that can really help you and bring you to success is really a great stroke of luck."

Luis Manuel Enrique Téllez Kuenzler (born October 13, 1958) is a Mexican economist. He is a former Secretary of Energy in the cabinet of Ernesto Zedillo and served as Secretary of Communications and Transportation in the cabinet of President Felipe Calderón until 2009.

Téllez graduated from the Instituto Tecnológico Autónomo de México (ITAM) with a bachelor's degree in Economics (summa cum laude) took post graduate studies in Law at the National Autonomous University of Mexico (UNAM) and received a doctorate's degree in Economics from the Massachusetts Institute of Technology.

He is a member of the Institutional Revolutionary Party (PRI) since 1980, where he headed the Institute for Economic, Social and Political Studies (IEPES). He joined the federal cabinet as Undersecretary of Planning at the Secretariat of Agriculture during the Carlos Salinas de Gortari administration, headed the Office of the Presidency in the Ernesto Zedillo administration and, from 1997 to 2000, served as his Secretary of Energy. During his tenure at the Secretariat of Agriculture, he wrote the book "La Modernizacion del Sector Agropecuario y Forestal", where the (1998-1994) administration's objectives with respect to the agricultural sector are laid out (ISBN 968164347X).

Otto Klemperer (14 May 1885 – 6 July 1973) was a German conductor and composer. He is widely regarded as one of the leading conductors of the 20th century. His son, Werner Klemperer, became famous for his role as Colonel Klink on the CBS television sitcom, Hogan's Heroes.

Otto Klemperer was born in Breslau, Silesia Province, then in Germany (now Wrocław, Poland), as a son of Nathan Klemperer, a native of Prague, Bohemia (today's Czech Republic). Klemperer studied music first at the Hoch Conservatory in Frankfurt, and later at the Stern Conservatory in Berlin under James Kwast and Hans Pfitzner. He followed Kwast to three institutions and credited him with the whole basis of his musical development. In 1905 he met Gustav Mahler while conducting the off-stage brass at a performance of Mahler's Symphony No. 2, 'Resurrection'. He also made a piano reduction of the second symphony. The two men became friends, and Klemperer became conductor at the German Opera in Prague in 1907 on Mahler's recommendation. Mahler wrote a short testimonial, recommending Klemperer, on a small card which Klemperer kept for the rest of his life. Later, in 1910, Klemperer assisted Mahler in the premiere of his Symphony No. 8, Symphony of a Thousand.