Katy Perry - Part Of Me
Prologues are not unconventional to Pop music videos and can also be seen in , Pink's "Trouble", Beyonce's "If I Were A Boy" and Taylor Swift's "White Horse", it helps to set the story and forward the narrative. It also engages the fewer.
P!nk's prologue for "Trouble" is quite basic, with long, mid and close up shot's. It basically set's the scene through the use of Mise-en-scene and action/reaction from the people within the shots however there is no speech.
Beyonce's - If I Were Boy, is also a pretty simplicity prologue, by just using lone words, which you could infer as describing relationships; "Honesty", "Commitment" etc.
Taylor Swifts - "White Horse" Has speech constantly running through it, during instrumentals. However the prologue is used to the set the scene then the rest of the music video is a flash back to how Swift got to the situation. The same clip is then repeated at the end, however it gives the audience the answer which Swift gives to her ex.
