^evolution is Ayu's number 1 up-beat song and one of many signature songs towards the public. It isn't hard to find parodies based on the evolution PV and that video outfit is among her most iconic... The song wasn't used to open her first Asia Tour for no reason, and it isn't on every tour and CDL she did since 2001 for no reason either.
It was chose because of it's context... Among the songs that represent Ayu the most (M, SEASON, Boys & Girls, etc), this one fits the theme of the movie the most, it represents the peak of Ayu's career and her most aclaimed album to date, the period where she was everywhere everytime, and it's video deals with Ayu's relationship with her fame.
They could go for a more obvious choice (or ask for a whole new song)... But not always the most obvious choice is also the most powerful.
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