[2][3] It received enough critical and commercial success that other compilations and expanded re-releases have been released in subsequent years.

The album features several songs performed by Kimya Dawson and her bands Antsy Pants and the Moldy Peaches, due to a suggestion by lead actor Elliot Page:[4] At one point, I [director Jason Reitman] asked [Elliot] Page before we started shooting, 'What do you think Juno listens to?'

I got in touch with Kimya Dawson of The Moldy Peaches and she started sending me her work, which was beautiful, and that became a lot of the soundtrack.

Dawson insisted on seeing the screenplay before allowing her songs to be in the film, after which she agreed to send Reitman a package of her solo albums to review.

[6] On April 8, 2008, a second soundtrack was released exclusively through the iTunes Store called Juno B-Sides: Almost Adopted Songs.

It contains songs that were originally slated for the film, including a version of the 20th Century Fox Fanfare by Kimya Dawson and Mateo Messina originally planned to be used before "The Simpsons beat [them] to it" (referring to how The Simpsons Movie begins with Ralph Wiggum singing along with the fanfare) and a song sung by Juno (Elliot Page[b]) in a deleted scene from the movie.