 " 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 inspires me to work on other artists ' songs [ because ] it pushes my boundaries in a direction that I wouldn ’ t necessarily come up with . <unk> I know how ' Crazy in Love ' goes , 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 makes it even more powerful . " 
