Question: Justin Hurwitz is best known for scoring an American musical romantic comedy-drama film that stars who as a jazz pianist?
Context: Ian Ernest Gilmore "Gil" Evans (born Green; May 13, 1912 – March 20, 1988) was a Canadian jazz pianist, arranger, composer and bandleader.  He is widely recognized as one of the greatest orchestrators in jazz, playing an important role in the development of cool jazz, modal jazz, free jazz and jazz fusion.  He is best known for his acclaimed collaborations with Miles Davis. Blue Hawaii is a 1961 American musical romantic comedy film set in the state of Hawaii and starring Elvis Presley.  The screenplay by Hal Kanter was nominated by the Writers Guild of America in 1962 in the category of Best Written American Musical.  The movie opened at no. 2 in box office receipts for that week and despite mixed reviews from critics, finished as the 10th top-grossing movie of 1961 and 14th for 1962 on the "Variety" national box office survey, earning $5 million.  The film won a fourth place prize Laurel Award in the category of Top Musical of 1961. La La Land is a 2016 American musical romantic comedy-drama film written and directed by Damien Chazelle.  It stars Ryan Gosling as a jazz pianist and Emma Stone as an aspiring actress, who meet and fall in love in Los Angeles while pursuing their dreams.  The film's title refers simultaneously to music, the city of Los Angeles, and to the idiom for being out of touch with reality. Justin Hurwitz (born 22 January 1985) is an American film composer and a television writer.  He is best known for scoring the film "La La Land".  He is a frequent collaborator with director Damien Chazelle and also scored Chazelle's two other features, "Guy and Madeline on a Park Bench" and "Whiplash". Gigi (full title Hank Jones Swings Songs from Lerner and Loewe's Gigi ) is an album by American jazz pianist Hank Jones featuring jazz adaptations of tunes from Alan Jay Lerner and Frederick Loewe's musical romantic comedy film "Gigi" recorded in 1958 and released on the Golden Crest label. Iiro Rantala (born 1970, in Helsinki) is a Finnish jazz pianist.  He studied piano in the jazz department of Sibelius Academy and classical piano at the Manhattan School of Music.  He is one of the best known Finnish jazz pianists, both in Finland and abroad.  Rantala is a pianist and composer with Trio Töykeät, a Finnish jazz trio.  In addition to jazz, he has composed some classical pieces, most notably the "Concerto for Piano and Concerto in G♯ΔA♭". From Justin to Kelly is a 2003 American musical romantic comedy film written by Kim Fuller and directed by Robert Iscove.  The film, starring "American Idol" first season winner Kelly Clarkson and runner-up Justin Guarini, won the Golden Raspberry Award for Worst 'Musical' of Our First 25 Years in 2005.  This film is often regarded as one of the worst movies ever made. "City of Stars" is a song performed by Ryan Gosling and Emma Stone from the film "La La Land" (2016).  The music of the song was composed by Justin Hurwitz while the lyrics were provided by Benj Pasek and Justin Paul.  The song won numerous awards, including the award for Best Original Song at both the 74th Golden Globe Awards and 89th Academy Awards. "La La Land" is a 2016 American romantic musical comedy-drama film written and directed by Damien Chazelle.  Starring Ryan Gosling and Emma Stone, the film focuses on two young people struggling to make ends meet in Los Angeles, while pursuing their dreams as artists.  Justin Hurwitz composed the film's musical score, while Linus Sandgren was the cinematographer.  David and Sandy Reynolds-Wasco were responsible for the production design and Mary Zophres designed the costumes. The "High School Musical" franchise consists of four Disney musical romantic comedy-drama films directed by Kenny Ortega and created by Peter Barsocchini.  It stars Zac Efron, Vanessa Hudgens, Ashley Tisdale, Lucas Grabeel, Corbin Bleu, and Monique Coleman.  The original film was released simply as a Disney Channel Original Movie, but after its huge success, it was followed by a television sequel.  The received a theatrical release.  Tisdale and Grabeel reprised their roles as Sharpay and Ryan Evans in a spin-off on the series titled "Sharpay's Fabulous Adventure", it was a direct to video film.  Numerous international versions have been created, plus stage musicals and video games have been released, among other things.  On March 1, 2016, a fourth installment was announced.  The films have developed a cult following.
Answer: Ryan Gosling