John Williams
John Towner Williams (born February 8, 1932) is an American composer, conductor, and pianist. Regarded by many as the greatest film composer of all time, he has composed some of the most popular, recognizable, and critically acclaimed film scores in cinematic history in a career spanning over six decades. Williams has won 25 Grammy Awards, seven British Academy Film Awards, five Academy Awards, and four Golden Globe Awards. With 52 Academy Award nominations, he is the second most-nominated individual, after Walt Disney. In 2005 the American Film Institute selected Williams's score to 1977's "Star Wars" as the greatest film score of all time. The Library of Congress also entered the "Star Wars" soundtrack into the National Recording Registry for being "culturally, historically, or aesthetically significant".
John Williams
Williams has composed for many critically acclaimed and popular movies, including the "Star Wars" Skywalker saga, "Schindler's List", "Close Encounters of the Third Kind", "Superman", "E.T. the Extra-Terrestrial", the "Indiana Jones" series, the first two "Home Alone" films, the first two "Jaws" films, the first two "Jurassic Park" films, "Hook", and the first three "Harry Potter" films. Williams has also composed numerous classical concertos and other works for orchestral ensembles and solo instruments. He served as the Boston Pops' principal conductor from 1980 to 1993 and is its laureate conductor. He has been associated with director Steven Spielberg since 1974, composing music for all but five of his feature films. Other works by Williams include theme music for the 1984 Summer Olympic Games, "NBC Sunday Night Football", "The Mission" theme used by NBC News and Seven News in Australia, the television series "Lost in Space" and "Land of the Giants", and the incidental music for the first season of "Gilligan's Island". Williams was inducted into the Hollywood Bowl's Hall of Fame in 2000, and received a Kennedy Center Honor in 2004 and the AFI Life Achievement Award in 2016. He has composed the score for eight of the top 25 highest-grossing films at the U.S. box office (adjusted for inflation). His work has influenced other film composers and contemporary classical and popular music.
Pedro Javier González
Pedro Javier González García (born 1962) is a Spanish flamenco, fusion, and classical guitarist, composer, and record producer. He has produced and collaborated with El Último de la Fila, Joan Manuel Serrat, Manolo García and María del Mar Bonet, Victoria de los Ángeles, and Angelo Branduardi. He has also performed at festivals with others such as B.B. King, John McLaughlin, Pat Metheny, Paco de Lucía, John Williams, Tommy Emmanuel, and Tomatito. Tempered and precise, he is one of the most versatile guitarists and composers in Spain.
Pedro Javier González
González was born in Barcelona. In the 1980s he studied with A. F. Serra and Juan Trilla and won the Premio al Toque por Bulerías and first prize in the Certamen de Guitarra flamenca. His first steps as a professional guitarist were supporting Toti Soler, Feliu Gasull, and Ovidi Montllor. He then played in a group with classical guitarists Yoshimi Otani, Alex Garrobé, and Xavier Coll.

Question: What  "Star Wars" composer has Pedro Javier González García performed with at festivals?
Answer: John Williams