Sometimes, the perfect song at the perfect moment can make all the difference in a film, and 2015 brought a plethora of great examples, from the pink-hued, out-of-nowhere dance scene in Alex Garland's “Ex Machina” — punctuated by Oliver Cheatham's “Get Down Saturday Night” — to the use of David Bowie's classic “Starman” in a montage from Ridley Scott's “The Martian.” Below, we've rounded up 10 particularly memorable examples from the past year.