 Crazy in Love  was re @-@ recorded by Beyoncé for the film Fifty Shades of Grey ( 2015 ) and used for its trailer which was released on July 24 , 2014 . This slowed @-@ down version was produced by Boots with violin arrangements by Margot , both of whom worked on Beyoncé 's fifth studio album . Margot said , " It inspire me to work on other artists ' songs [ because ] it push my boundaries in a direction that I wouldn ’ t necessarily come up with . Obviously I know how ' Crazy in Love ' go , but I knew there was the possibility her vocals would be different . It 's almost more vulnerable and beautiful this way , because you do do crazy things when you fall in love . To hear the mood reversed and flipped make it even more powerful . "