"Do You Want to Build a Snowman?" is a song from the 2013 Disney animated feature film Frozen, with music and lyrics composed by Kristen Anderson-Lopez and Robert Lopez. As of November 25, 2016, the total sales of the digital track stands at 1,600,000 downloads according to Nielsen SoundScan, placing it second on the list of all-time best-selling Christmas/holiday digital singles in SoundScan history (behind Mariah Carey's 1994 hit single, "All I Want for Christmas Is You").

Anna puts her hands on the door of a room in which Elsa, who had recently harmed Anna with her powers, and requests that she should build a snowman to no avail.

At one point Disney considered removing the song from the film because as originally composed, it was too sad, and it was also too complicated in that it contained too much exposition. However it was put back after being well received by the Disney staff. StitchKingdom explains, "due to pacing of the film, this song was constantly being cut and put back in during the film’s development. Ultimately, studio employees demanded it stay in." During the film's development, Lopez at one point had to travel to Los Angeles to work in person with the production team to try to fix the song, and they had to sit down and work through how Elsa sounds like versus how Anna sounds like.Christophe Beck, who wrote the film's score, added the interlude for the montage scenes.

After the film was released, a fan put together a version of the song to show how a reprise could have worked at the climax of the film, when Elsa realizes that Anna is completely frozen. Commenting on the fan clip in January 2014, Anderson-Lopez mentioned that at one point, she actually had pitched a reprise of the song for the film's climax. Lopez added, "if you watch it in the flow of the movie, it would be jarring to have them break into song at that moment."

When the same clip was mentioned in an interview, director Jennifer Lee explained that according to Disney music producer Chris Montan (who has worked on nearly every Disney and Pixar animated film from the start of the Disney Renaissance), it is traditional in Disney animated musicals to have no more songs after the end of the second act.

...
Wikipedia