Answer:
In the opening fight sene you could use a fast paced song like punk rocky maybe like sugar we're going down by fall out boy
for the party I recommend a piece of classical music I quite like "the merry go round of life" by Joe Hisaishi it has no words it is a ballroom song or maybe the way you look tonight by Frank sinatra
For the balcony scene id say kiss from a rose by seal. it seems fitting as in this scene it says "that which we call a rose, By any other name would smell as sweet"
The wedding id use a thousand years by Christina perri :)
