"Tonight" is a popular

Popular music

Popular music belongs to any of a number of musical genres "having wide appeal" and is typically distributed to large audiences through the music industry. It stands in contrast to both art music and traditional music, which are typically disseminated academically or orally to smaller, local...

 song

Song

In music, a song is a composition for voice or voices, performed by singing.A song may be accompanied by musical instruments, or it may be unaccompanied, as in the case of a cappella songs...

 with music written by Leonard Bernstein

Leonard Bernstein

Leonard Bernstein August 25, 1918 – October 14, 1990) was an American conductor, composer, author, music lecturer and pianist. He was among the first conductors born and educated in the United States of America to receive worldwide acclaim...

 and the lyrics by Stephen Sondheim

Stephen Sondheim

Stephen Joshua Sondheim is an American composer and lyricist for stage and film. He is the winner of an Academy Award, multiple Tony Awards including the Special Tony Award for Lifetime Achievement in the Theatre, multiple Grammy Awards, a Pulitzer Prize and the Laurence Olivier Award...

 and was published in 1956

1956 in music

-Events:*January 26 – Buddy Holly's first recording sessions for Decca Records take place in Nashville, Tennessee*Roy Orbison signs with Sun Records*January 27 – Elvis Presley's single "Heartbreak Hotel" / "I Was the One" is released...

.

It was introduced in the Broadway musical West Side Story. The song was revived in 1961 on single records in versions by Ferrante & Teicher

Ferrante & Teicher

Ferrante & Teicher were a duo of American piano players, known for their light arrangements of familiar classical pieces, movie soundtracks, and show tunes.-Career:...

 (#8 pop

Billboard Hot 100

The Billboard Hot 100 is the United States music industry standard singles popularity chart issued weekly by Billboard magazine. Chart rankings are based on radio play and sales; the tracking-week for sales begins on Monday and ends on Sunday, while the radio play tracking-week runs from Wednesday...

, #2 easy listening

Hot Adult Contemporary Tracks

The Adult Contemporary chart is a weekly chart published in Billboard magazine that lists the most popular songs on adult contemporary and "lite-pop" radio stations in the United States...

) and Eddie Fisher

Eddie Fisher (singer)

Edwin Jack "Eddie" Fisher , was an American entertainer. He was one of the world's most famous and successful singers in the 1950s, selling millions of records and hosting his own TV show. His divorce from his first wife, Debbie Reynolds, to marry his best friend's widow, Elizabeth Taylor, garnered...

, whose version narrowly missed the Top 40. Shirley Bassey

Shirley Bassey

Dame Shirley Bassey, DBE , is a Welsh singer. She found fame in the late 1950s and was "one of the most popular female vocalists in Britain during the last half of the 20th century"...

 recorded the song in 1962, where it peaked at #21 on the UK charts, becoming the only recording of this song to chart on the UK charts. Jay and the Americans

Jay and the Americans

Jay and the Americans was a pop music group popular in the 1960s. Their initial lineup consisted of John "Jay" Traynor, Howard Kane , Kenny Vance and Sandy Deanne , though their greatest success on the charts came after Traynor had been replaced as lead singer by Jay Black.-Early years:They were...

 also released a cover version of the song. Sergio Franchi

Sergio Franchi

Sergio Franchi was an Italian tenor.Franchi was born in Cremona, Italy. His father wanted him to become an electrical engineer, so he studied both music and engineering simultaneously. The family moved to South Africa in 1952, where Sergio worked part-time as a draftsman, while continuing to study...

 recorded the song in his 1963 RCA Victor Red Seal Album, Broadway, I Love You.

Many of the pieces in "West Side Story" experiment with different melodic tricks. This song is notable for its prominent perfect fourth intervals, and a theme that starts on a pentatonic scale

Pentatonic scale

A pentatonic scale is a musical scale with five notes per octave in contrast to a heptatonic scale such as the major scale and minor scale...

 but develops into a western key.

Jenna Ushkowitz sang the song on Glee

Glee (TV series)

Glee is an American musical comedy-drama television series that airs on Fox in the United States, and on GlobalTV in Canada. It focuses on the high school glee club New Directions competing on the show choir competition circuit, while its members deal with relationships, sexuality and social issues...

, on the episode Preggers

Preggers (Glee)

"Preggers" is the fourth episode of the American television series Glee. The episode premiered on the Fox network on September 23, 2009, and was written and directed by executive producer Brad Falchuk. "Preggers" sees glee club member Kurt join the football team and admit his homosexuality to his...

. The song also was a plot device in the episode. When Tina (Ushkowitz) gets the part, Rachel (Lea Michele

Lea Michele

Lea Michele Sarfati , known professionally as Lea Michele, is an American actress and singer. Michele began working professionally as a child actress on Broadway in productions such as Ragtime and Les Misérables. She originated the role of Wendla in the musical Spring Awakening and currently plays...

) says that she thought all West Side Story material goes to herself, also with both her and Natalie Wood

Natalie Wood

Natalie Wood, born Natalia Nikolaevna Zacharenko was an American film and television actress. After first working in films as a child, Wood became a successful Hollywood star as a young adult, receiving three Academy Award nominations before she was 25 years old.Wood began acting in movies at the...

 being Jewish. At the end, when Tina still gets the song, Rachel quits Glee Club to star as Sally Bowles in the school production of Cabaret

Cabaret (musical)

Cabaret is a musical based on a book written by Christopher Isherwood, music by John Kander and lyrics by Fred Ebb. The 1966 Broadway production became a hit and spawned a 1972 film as well as numerous subsequent productions....

. Tonight was featured again in the fifth episode of the third season of the show, "The First Time

The First Time (Glee)

"The First Time" is the fifth episode of the third season of the American musical television series Glee, and the 49th overall. Written by Roberto Aguirre-Sacasa and directed by co-executive producer Bradley Buecker, it first aired on Fox in the United States on November 8, 2011...

", this time sung by Lea Michele and Darren Criss

Darren Criss

Darren Everett Criss is an American actor, singer-songwriter, musician, composer, and a founding member and co-owner of the theater company StarKid Productions. He currently portrays Blaine Anderson, an openly gay high school student, on the FOX television series Glee...

.