Question: Who founded the famous chain of music-themed restaurants that opened its first establishment in the city Into the Gauntlet is in?

full_context: Document 1: Mexico City: The city is also a leading center of popular culture and music. There are a multitude of venues hosting Spanish and foreign-language performers. These include the 10,000-seat National Auditorium that regularly schedules the Spanish and English-language pop and rock artists, as well as many of the world's leading performing arts ensembles, the auditorium also broadcasts Grand Opera performances from New York's Metropolitan Opera on giant, high definition screens. In 2007 National Auditorium was selected world's best venue by multiple genre media.
Document 2: London: London was instrumental in the development of punk music, with figures such as the Sex Pistols, The Clash, and Vivienne Westwood all based in the city. More recent artists to emerge from the London music scene include George Michael, Kate Bush, Seal, Siouxsie and the Banshees, Bush, the Spice Girls, Jamiroquai, Blur, The Prodigy, Gorillaz, Mumford & Sons, Coldplay, Amy Winehouse, Adele, Ed Sheeran and One Direction. London is also a centre for urban music. In particular the genres UK garage, drum and bass, dubstep and grime evolved in the city from the foreign genres of hip hop and reggae, alongside local drum and bass. Black music station BBC Radio 1Xtra was set up to support the rise of home-grown urban music both in London and in the rest of the UK.
Document 3: Origin (Brown novel): Arriving in Barcelona, Langdon and Ambra go to Casa Milà, where they search for the poem. Langdon learns that Kirsch was dying of pancreatic cancer, prompting a rushed release of the presentation. Though he first thinks the poem is by Friedrich Nietzsche, he soon finds a box supposedly containing a book of the complete works of artist William Blake, who was also a poet specializing in prophecies. The box is empty except for a slip stating that Kirsch donated the book to Sagrada Família, leaving it open at a specific page. Soon the police arrive and, as Ambra tries to explain she wasn't kidnapped, Kirsch's phone is destroyed in the chaos. Ambra's guards arrive in a helicopter and get her and Langdon to safety. Langdon assures Ambra that he can find Winston's physical location and she makes her guards take them to Sagrada Familia under threat of dismissal.
Document 4: Pretty Little Liars (season 2): Eventually, Alison is linked to an old doll hospital in town nearby called Brookhaven, and later a rural motel, The Lost Woods Resort. The girls attend a masquerade party, where they plan to confront ``- A ''who appears to be a woman dressed as The Black Swan from Swan Lake. Spencer, accompanied by Mona, rides out to Lost Woods, while the other girls chase`` - A''. Spencer and Mona are able to steal the key to one of the rooms, which is revealed to be ``- A's ''Lair. Mona then reveals to Spencer that she is`` - A'', while the woman at the costume party was only a decoy. Mona knocks Spencer unconscious, driving her to a nearby cliff. She gives Spencer the option of joining her ``- A ''Team, or dying.
Document 5: Hard Rock Cafe: The chain began to expand worldwide in 1982 with locations in (among others) Toronto, Los Angeles, San Francisco, Chicago, Paris, and Berlin. Hard Rock Cafe locations in the United States vary from smaller, more tourist driven markets (Biloxi, Pigeon Forge, Key West, etc.) to large metropolises (Houston, Philadelphia, New York City, Chicago, Boston, Washington, D.C., etc.). Hard Rock Cafe typically does not franchise cafe locations in the United States. All US cafes are corporate owned and operated, except for cafes in Tampa and Four Winds New Buffalo casino. However, in the transition of the Las Vegas Hard Rock Hotel property originally owned and then later sold to Rank by founder Peter Morton, Morton retained hotel naming rights west of the Mississippi. When Morton sold his Las Vegas Hard Rock Hotel to the Morgans Hotel Group, he also sold those naming rights, which then gave rise to two US franchised hotels (without cafes) in Albuquerque and Tulsa. The Albuquerque hotel no longer pays for the Hard Rock rights and reverted to its former name in June 2013. More hotels franchised from Morgan's are planned for Sioux City and Vancouver.
Document 6: Into the Gauntlet: Into the Gauntlet is the tenth book in "The 39 Clues" novel series. It was written by Margaret Peterson Haddix and released on August 31, 2010. In the beginning of the book, Amy and Dan are now at the end of their clue hunt, and every misfortune they've had. Their lead is a poem found in their hotel room. However, it is then stolen by Isabel Kabra. It is revealed that William Shakespeare was a powerful Madrigal and the most important clue is on the line against their competitors. Dan and Amy are supposed to go to the Globe theater to watch a Shakespeare play, "Romeo and Julliet". While watching the show they see what looks to be ninjas. The ninjas find a clue at the top of the theater but drop it into the hands of Dan and Amy. As it turns out the whole Cahill family is at the play looking for the clue. Backstage of the play the fight over the paper found at the theater. Mr. McIntyre and Fiske Cahill reveal there is another family out there that makes Isabel Kabra look like Mother Teresa. The globe on the 39 Clues symbol is, unlike in the first nine books, shattered into pieces.
Document 7: Hard Rock Cafe: In 1990, The Rank Group, a London-based leisure company, acquired Mecca Leisure Group and continued expansion of the concept in its geographic territory. Rank went on to purchase Hard Rock America from Peter Morton as well as Hard Rock Canada from Nick Bitove. After the completion of these acquisitions, Rank gained worldwide control of the brand. In March 2007, the Seminole Tribe of Florida acquired Hard Rock Cafe International, Inc. and other related entities from Rank for US$965 million.In 2008, anonymous members of the wait staff criticized the business because of its practice of paying them less than half the official minimum wage in the UK, with the business allocating tips to staff to bring their salaries within the law. Most customers, it was argued, do not realize that they are subsidizing a low wage when they give the tip.
Document 8: Isaac Tigrett: Isaac Burton Tigrett (born November 28, 1948, Jackson, Tennessee) is an American businessman, best known as the co-founder of Hard Rock Café and House of Blues.
Document 9: Hard Rock Hotel & Casino Atlantic City: Construction of what was originally known as the Taj Mahal commenced in 1983 by Resorts International, owner of the neighboring Resorts Casino Hotel, with an estimated budget of $250 million. Resorts head James Crosby said it might be named the United States Hotel, in reference to the city's first major hotel.
Document 10: Mexico City: Other popular sites for pop-artist performances include the 3,000-seat Teatro Metropolitan, the 15,000-seat Palacio de los Deportes, and the larger 50,000-seat Foro Sol Stadium, where popular international artists perform on a regular basis. The Cirque du Soleil has held several seasons at the Carpa Santa Fe, in the Santa Fe district in the western part of the city. There are numerous venues for smaller musical ensembles and solo performers. These include the Hard Rock Live, Bataclán, Foro Scotiabank, Lunario, Circo Volador and Voilá Acoustique. Recent additions include the 20,000-seat Arena Ciudad de México, the 3,000-seat Pepsi Center World Trade Center, and the 2,500-seat Auditorio Blackberry.
Document 11: Percy Jackson & the Olympians: The Lightning Thief: The trio heads out, locating the first pearl at an old garden center before they suddenly encounter Medusa, who tries to kill them until she is decapitated by Percy; they take her head with them for later use. They locate the second pearl in the Parthenon in Nashville; Percy uses the winged shoes to take it from a statue of Athena. However, they are then confronted by the Hydra, which Grover turns to stone using Medusa's head. The last pearl is located at the Lotus Casino in Las Vegas, where the three eat lotus flowers, which make them forget their reason for being there. They stay in the casino for five days until Poseidon speaks in Percy's mind, helping Percy return to his senses. Percy frees Grover and Annabeth from the effects of the flowers and they flee, discovering that the casino is run by the Lotus - Eaters, and they had been keeping people captive since ancient times. With all three pearls, Percy, Grover, and Annabeth head into the Underworld, the portal to which is located in Hollywood.
Document 12: London: London has numerous venues for rock and pop concerts, including the world's busiest arena the o2 arena and other large arenas such as Earls Court, Wembley Arena, as well as many mid-sized venues, such as Brixton Academy, the Hammersmith Apollo and the Shepherd's Bush Empire. Several music festivals, including the Wireless Festival, South West Four, Lovebox, and Hyde Park's British Summer Time are all held in London. The city is home to the first and original Hard Rock Cafe and the Abbey Road Studios where The Beatles recorded many of their hits. In the 1960s, 1970s and 1980s, musicians and groups like Elton John, Pink Floyd, David Bowie, Queen, The Kinks, The Rolling Stones, The Who, Eric Clapton, Led Zeppelin, The Small Faces, Iron Maiden, Fleetwood Mac, Elvis Costello, Cat Stevens, The Police, The Cure, Madness, The Jam, Dusty Springfield, Phil Collins, Rod Stewart and Sade, derived their sound from the streets and rhythms vibrating through London.
Document 13: Isaac Tigrett: On June 14, 1971 he and Peter Morton started the first Hard Rock Café (HRC) restaurant in London's fashionable Mayfair district. The restaurant combined rock music, memorabilia related to rock 'n' roll and American cuisine.
Document 14: Southampton: Southampton has two large live music venues, the Mayflower Theatre (formerly the Gaumont Theatre) and the Guildhall. The Guildhall has seen concerts from a wide range of popular artists including Pink Floyd, David Bowie, Delirious?, Manic Street Preachers, The Killers, The Kaiser Chiefs, Amy Winehouse, Lostprophets, The Midnight Beast, Modestep, and All Time Low. It also hosts classical concerts presented by the Bournemouth Symphony Orchestra, City of Southampton Orchestra, Southampton Concert Orchestra, Southampton Philharmonic Choir and Southampton Choral Society.
Document 15: Into the Gauntlet: "Into the Gauntlet" begins as Amy and Dan Cahill enter a London hotel tired and with no lead whatsoever. They receive another lead, but this is stolen by Isabel Kabra via a pet monkey, who leaves them a coin with a fancy script K on it. However, Dan, who has already memorized it, rewrites it. Amy looks all over the Internet to find out what it means, and she is about to shout out when Nellie realizes that the Kabra coin is a bug. She destroys it, along with three other bugs from each of the other three branches. Amy then tells them that the clue leads to William Shakespeare, so they go to a performance of Romeo and Juliet in The Globe Theatre. Once there, they confront the Starlings, who are back in the clue hunt after being sent to the hospital in an explosion back in "The Maze of Bones", and steal their lead, but they are trapped by Jonah Wizard, who was forced back into the clue hunt by Cora Wizard, the Holts, Alistair Oh, and the Kabras. Hamilton Holt steals the piece of paper with the lead, but Dan rips off the top and bottom, and he and Amy run away while everyone else is fighting over the rest of the lead. Their section of the lead says: "For this great man we sing was b here". The rest of the word that goes with the letter "b" was torn off, so they assume that it was supposed to be "born".
ground_truth: Peter Morton
sub_queries: Which place is Into the Gauntlet in? Answer: London
What famous chain of music-themed restaurants opened its first establishment in London ? Answer: Hard Rock Cafe
Hard Rock Cafe >> founded by Answer: Peter Morton