Question: Which Stephen Sondheim-penned musical was inspired by "Romeo and Juliet"?

Context articles: Romeo, Juliet and Darkness
West Side Story
Characters in Romeo and Juliet
Romeo × Juliet
A rose by any other name would smell as sweet
Romeo + Juliet
Romeo and Juliet Windmill
Romeo and Juliet on screen
Romeo
Stephen Sondheim

Romeo, Juliet and Darkness (Czech: "Romeo, Julie a tma" ) is a 1960 Czech drama film directed by Jiří Weiss.
 Inspired by William Shakespeare's "Romeo and Juliet", the film is about problems experienced by a young Jewish woman who is hidden from the Gestapo by a student lover.
West Side Story is a musical with a book by Arthur Laurents, music by Leonard Bernstein, lyrics by Stephen Sondheim and conception and choreography by Jerome Robbins.
 It was inspired by William Shakespeare's play "Romeo and Juliet".
Prince Escalus, the Prince of Verona, is the desperate resolver of the feuding families.
 He is based on the actual Scaligeri family which ruled Verona, possibly on Bartolomeo I.
 Escalus is the voice of authority in Verona.
 He appears only three times within the text and only to administer justice following major events in the feud between the Capulet and Montague families.
 He first punishes Capulet and Montague for the quarrel between Tybalt, Benvolio, and a handful of servants.
 He returns too late to stop the fatal brawls between Tybalt and Mercutio and, subsequently, Tybalt and Romeo.
 Escalus is prepared to execute Romeo for his offence—Romeo's killing Tybalt—but lightens the sentence to lifetime banishment from Verona, when Benvolio insists that Tybalt started the quarrel by murdering Mercutio, a kinsman to the Prince.
 He yells at Lord Montague for engaging in the feud, which really is the root cause which led to Tybalt killing Mercutio.
 So, according to him, he lost his dear kinsman because of Lord Montague, so by exiling Romeo, Escalus gives him a 'taste of Montague's own medicine', to see how Montague feels when he loses a loved one.
 Prince Escalus returns in the final scene—V.iii—following the double suicide of Romeo and Juliet, and at last declares the Lords Montague and Capulet guilty of Romeo and Juliet's death, and angrily tells them that their totally useless feud resulted in the deaths of not only their own loved ones (Lady Montague, Romeo, Juliet, and Tybalt), but also in the deaths of Escalus' loved ones (Mercutio and Paris).
 He curses the feud that kills Romeo and Juliet whom he really feels sad for, just before the Lords come to peace with each other.
 In the end, Prince Escalus becomes very happy that the feud has finally ended, even if with a heavy price, since it ended late.
Romeo × Juliet (ロミオ×ジュリエット , Romio to Jurietto ) is an anime television series, loosely based on William Shakespeare's classical play, "Romeo and Juliet", along with numerous references and characters from other Shakespearean plays.
 Though the anime borrows mostly from Shakespeare's story, the manga adaptation differs extensively from the original.
 "Romeo × Juliet" was broadcast in Japan on Chubu-Nippon, broadcasting from April 4, 2007 to September 26, 2007.
 In 2009, "Romeo × Juliet" was dubbed into English and released by Funimation Entertainment.
"A rose by any other name would smell as sweet" is a popular reference to William Shakespeare's play "Romeo and Juliet", in which Juliet seems to argue that it does not matter that Romeo is from her rival's house of Montague, that is, that he is named "Montague."
 The reference is often used to imply that the names of things do not affect what they really are.
 This formulation is, however, a paraphrase of Shakespeare's actual language, seen underlined below.
 This scene is called the balcony scene by many people.
 Juliet not only makes the statement above but compares Romeo to a rose saying that if he wasn't named Romeo he would still be handsome and be Juliet's Love.
 Also as said before this states that if he wasn't Romeo, then he wouldn't be a Montague and she would be able to get married with no problem at all.
William Shakespeare's Romeo + Juliet (shortened to Romeo + Juliet) is a 1996 American romantic drama film directed, co-produced, and co-written by Baz Luhrmann, co-produced by Gabriella Martinelli, and co-written by Craig Pearce, being an adaptation and modernization of William Shakespeare's tragedy "Romeo and Juliet".
 The film stars Leonardo DiCaprio and Claire Danes in the leading roles of Romeo and Juliet, who instantly fall in love when Romeo crashes a party and meets her, despite their being members of the Montague and Capulet family; Brian Dennehy, John Leguizamo, Pete Postlethwaite, Paul Sorvino, and Diane Venora star in supporting roles.
The Romeo and Juliet Windmill, is a wooden structure designed by architect Frank Lloyd Wright in the town of Wyoming, Wisconsin (Wyoming is south of the town of Spring Green).
 It was designed in 1896 after being commissioned by Wright's aunts, Jane and Ellen Lloyd Jones, who needed the windmill to provide water for their school, the Hillside Home School.
 The diamond-shaped portion of the windmill intersects the portion with the balcony that sits on an octagonal structure.
 The balcony is accessible through an interior stairway.
 Wright named these two parts of the building "Romeo" and "Juliet".
 "Romeo" is the lozenge and Juliet, the octagon.
 Architectural historian, Neil Levine explained the principles behind the lozenge and octagon: [Wright] gave the tower a bold geometric form as a structural solution to the expression of the tower's role as a landmark.
 The pump rod and support for the wheel are carried up within an acutely angled lozenge shape pointed southeast to deflect blasts of wind like a "storm prow".
 This angular element is inserted halfway into a larger octagonal volume that contains and supports it throughout nearly its full height.
 Wright called the composition Romeo and Juliet, likening its conjugate geometry to an amorous union.
William Shakespeare's Romeo and Juliet may be one of the most-screened plays of all time.
 The most notable theatrical releases were George Cukor's multi-Oscar-nominated 1936 production "Romeo and Juliet", Franco Zeffirelli's 1968 film "Romeo and Juliet", and Baz Luhrmann's 1996 MTV-inspired "Romeo + Juliet".
 The latter two were both, at the time, the highest-grossing Shakespeare films.
 Cukor featured the mature actors Norma Shearer and Leslie Howard as the teenage lovers while Zeffirelli populated his film with beautiful young people, and Baz Luhrmann produced a heavily cut fast-paced version aimed at teenage audiences.
Romeo Montague (Italian: "Romeo Montecchi" ) is the protagonist of William Shakespeare's tragedy "Romeo and Juliet".
 The son of Montague and his wife, he secretly loves and marries Juliet, a member of the rival House of Capulet.
 Forced into exile after slaying Juliet's cousin, Tybalt, in a duel, Romeo commits suicide upon hearing falsely of Juliet's death.
Stephen Joshua Sondheim ( ; born March 22, 1930) is an American composer and lyricist known for more than a half-century of contributions to musical theatre.
 Sondheim has received an Academy Award, eight Tony Awards (more than any other composer, including a Special Tony Award for Lifetime Achievement in the Theatre), eight Grammy Awards, a Pulitzer Prize, a Laurence Olivier Award, and a 2015 Presidential Medal of Freedom.
 He has been described by Frank Rich of "The New York Times" as "now the greatest and perhaps best-known artist in the American musical theater."
 His best-known works as composer and lyricist include "A Funny Thing Happened on the Way to the Forum", "Company", "Follies", "A Little Night Music", "Pacific Overtures", "", "Merrily We Roll Along", "Sunday in the Park with George", "Into the Woods", "Assassins", and "Passion".
 He also wrote the lyrics for "West Side Story" and "Gypsy".