The main title is the name given on soundtrack album

Soundtrack album

A soundtrack album is any album that incorporates music directly recorded from the soundtrack of a particular feature film or television program. In some cases, not all the tracks from the movie are included in the album; however there are rare cases of songs in the trailers that do not appear in...

s to the music that is heard in a film while the opening credits

Opening credits

In a motion picture, television program, or video game, the opening credits are shown at the very beginning and list the most important members of the production. They are now usually shown as text superimposed on a blank screen or static pictures, or sometimes on top of action in the show. There...

 are rolling. It does not refer to music playing from on-screen sources such as radios, as in the original opening credits sequence in Touch of Evil

Touch of Evil

Touch of Evil is a 1958 American crime thriller film, written, directed by, and co-starring Orson Welles. The screenplay was loosely based on the novel Badge of Evil by Whit Masterson...

.

A main title can consist of a tune sung by the leading character over the credits, such as Moon River

Moon River

"Moon River" is a song composed by Johnny Mercer and Henry Mancini in 1961, for whom it won that year's Academy Award for Best Original Song. It was originally sung in the movie Breakfast at Tiffany's by Audrey Hepburn, although it has been covered by many other artists...

, sung by Audrey Hepburn

Audrey Hepburn

Audrey Hepburn was a British actress and humanitarian. Although modest about her acting ability, Hepburn remains one of the world's most famous actresses of all time, remembered as a film and fashion icon of the twentieth century...

 in Breakfast at Tiffany's, or the main orchestral theme as written by the composer, such as the famous The Pink Panther Theme. It can also be a medley of themes from the film, as in the 1959 Ben-Hur

Ben-Hur (1959 film)

Ben-Hur is a 1959 American epic film directed by William Wyler and starring Charlton Heston in the title role, the third film adaptation of Lew Wallace's 1880 novel Ben-Hur: A Tale of the Christ. The screenplay was written by Karl Tunberg, Gore Vidal, and Christopher Fry. The score was composed by...

. In the film A Hard Day's Night

A Hard Day's Night (film)

A Hard Day's Night is a 1964 British black-and-white comedy film directed by Richard Lester and starring The Beatles—John Lennon, Paul McCartney, George Harrison and Ringo Starr—during the height of Beatlemania. It was written by Alun Owen and originally released by United Artists...

, the title tune was heard over the opening credits showing the Beatles running from their fans. An overture

Overture

Overture in music is the term originally applied to the instrumental introduction to an opera...

 may serve as a main title, as in The Sound of Music

The Sound of Music

The Sound of Music is a musical by Richard Rodgers, lyrics by Oscar Hammerstein II and a book by Howard Lindsay and Russel Crouse. It is based on the memoir of Maria von Trapp, The Story of the Trapp Family Singers...

.

In movie musicals, the main title nearly always consists of one or more of the songs from the film, played by the orchestra.