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Sir Richard Francis Burton  (; 19 March 1821 - 20 October 1890) was a British explorer, geographer, translator, writer, soldier, orientalist, cartographer, ethnologist, spy, linguist, poet, fencer, and diplomat. He was famed for his travels and explorations in Asia, Africa and the Americas, as well as his extraordinary knowledge of languages and cultures. According to one count, he spoke 29 European, Asian and African languages.
Motivated by his love of adventure, Burton got the approval of the Royal Geographical Society for an exploration of the area, and he gained permission from the board of directors of the British East India Company to take leave from the army. His seven years in India gave Burton a familiarity with the customs and behaviour of Muslims and prepared him to attempt a Hajj (pilgrimage to Mecca and, in this case, Medina). It was this journey, undertaken in 1853, which first made Burton famous. He had planned it whilst traveling disguised among the Muslims of Sindh, and had laboriously prepared for the adventure by study and practice (including undergoing the Muslim tradition of circumcision to further lower the risk of being discovered).  Although Burton was certainly not the first non-Muslim European to make the Hajj (Ludovico di Varthema did this in 1503), his pilgrimage is the most famous and the best documented of the time. He adopted various disguises including that of a Pashtun to account for any oddities in speech, but he still had to demonstrate an understanding of intricate Islamic traditions, and a familiarity with the minutiae of Eastern manners and etiquette. Burton's trek to Mecca was dangerous, and his caravan was attacked by bandits (a common experience at the time). As he put it, though "... neither Koran or Sultan enjoin the death of Jew or Christian intruding within the columns that note the sanctuary limits, nothing could save a European detected by the populace, or one who after pilgrimage declared himself an unbeliever". The pilgrimage entitled him to the title of Hajji and to wear the green head wrap. Burton's own account of his journey is given in A Personal Narrative of a Pilgrimage to Al-Madinah and Meccah.  When Burton returned to the British Army, he sat for examination as an Arab linguist. The examiner was Robert Lambert Playfair, who disliked Burton. As Professor George Percy Badger knew Arabic well, Playfair asked Badger to oversee the exam. Having been told that Burton could be vindictive, and wishing to avoid any animosity should Burton fail, Badger declined. Playfair conducted the tests; despite Burton's success living as an Arab, Playfair had recommended to the committee that Burton be failed. Badger later told Burton that "After looking [Burton's test] over, I [had] sent them back to [Playfair] with a note eulogising your attainments and ... remarking on the absurdity of the Bombay Committee being made to judge your proficiency inasmuch as I did not believe that any of them possessed a tithe of the knowledge of Arabic you did."
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What did he do in 1851?

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Sergio Santos Mendes (Portuguese pronunciation: ['seRZju 'satuZ 'medZiS]; born February 11, 1941) is a Brazilian musician. He has over 55 releases, and plays bossa nova heavily crossed with jazz and funk. He was nominated for an Academy Award for Best Original Song in 2012 as co-writer of the song "Real in Rio" from the animated film Rio. Mendes is married to Gracinha Leporace, who has performed with him since the early 1970s.
Mendes was born in Niteroi, Brazil, the son of a physician. He attended the local conservatory with hopes of becoming a classical pianist. As his interest in jazz grew, he started playing in nightclubs in the late 1950s just as bossa nova, a jazz-inflected derivative of samba, was emerging. Mendes played with Antonio Carlos Jobim (regarded as a mentor) and many U.S. jazz musicians who toured Brazil.  Mendes formed the Sexteto Bossa Rio and recorded Dance Moderno in 1961. Touring Europe and the United States, Mendes recorded albums with Cannonball Adderley and Herbie Mann and played Carnegie Hall. Mendes moved to the U.S. in 1964 and cut two albums under the Sergio Mendes & Brasil '65 group name with Capitol Records and Atlantic Records.  Sergio became full partners with Richard Adler, a Brooklyn-born American who had previously brought Bossa Tres plus two dancers, Joe Bennett and a Brazilian partner, to appear on The Ed Sullivan Show, in 1963. He was also accompanied by Jobim; Flavio Ramos, and Aloisio Olivera, a record and TV producer from Rio. The Musicians Union only allowed this group to appear on one TV show and one club appearance (Basin Street East) before ordering them to leave the U.S. When the new group, Brasil '65 was formed, Shelly Manne, Bud Shank and other West Coast musicians got Sergio and the others into the local musicians union. Adler and Mendes formed Brasil '65, which consisted of Wanda Sa and Rosinha de Valenca, as well as the Sergio Mendes Trio. The group recorded albums for Atlantic and Capitol.
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did he become a pianist early in his career?

Answer:
he started playing in nightclubs in the late 1950s just as bossa nova, a jazz-inflected derivative of samba, was emerging.