Guardians Of The Galaxy

In August 2013, Gunn revealed that Tyler Bates would be composing the film's score. Gunn stated that Bates would write some of the score first so that he can film to the music, as opposed to scoring to the film.[151] In February 2014, Gunn revealed that the film would incorporate songs from the 1960s and 1970s, such as "Hooked on a Feeling", on a mixtape in Quill's Walkman, which acts as a way for him to stay connected to the Earth, home, and family he lost. In May 2014, Gunn added that using the songs from the 60s and 70s were "cultural reference points", saying, "It’s striking the balance throughout the whole movie, through something that is very unique, but also something that is easily accessible to people at the same time. The music and the Earth stuff is one of those touchstones that we have to remind us that, yeah, [Quill] is a real person from planet Earth who’s just like you and me. Except that he’s in this big outer space adventure."

When choosing the songs, Gunn revealed he "started the process by reading the Billboard charts for all of the top hits of the '70s", downloading "a few hundred" songs that were "semi-familiar — ones you recognize but might not be able to name off the top of your head" and creating a playlist for all the songs that would fit the film tonally. He added that he "would listen to the playlist on my speakers around the house — sometimes I would be inspired to create a scene around a song, and other times I had a scene that needed music and I would listen through the playlist, visualizing various songs, figuring out which would work the best." Most of the songs were played on set to help "the actors and the camera operators find the perfect groove for the shot", with David Bowie's "Moonage Daydream" the only song chosen and added during post-production. Gunn also said that the opening scenes were designed with "Hooked on a Feeling" in mind; however once Gunn discovered "Come and Get Your Love", the song used in the sequence, Gunn felt it was a "better fit."

Three albums were released by Hollywood Records on July 29, 2014: The film's score, Guardians of the Galaxy (Original Score), which features the music composed by Bates for the film; Guardians of the Galaxy: Awesome Mix Vol. 1 (Original Motion Picture Soundtrack), which comprises the twelve songs from Quill's mixtape; and a deluxe edition featuring both albums. By August 2014, the album which mirrored Quill's mixtape had reached the top of the Billboard 200 chart, becoming the first soundtrack album in history consisting entirely of previously released songs to top the chart. Hollywood Records also released a cassette version of the Awesome Mix Vol. 1 soundtrack on November 28, 2014, as an exclusive to Record Store Day participants. The cassette, which is the first cassette Disney Music Group has released since 2003, comes with a digital download version of the album.