Break this rule and things can get very weird. Anyone who makes films needs to get this aspect of continuity firmly in thier minds. The camera must not cross the action axis without letting the audience 'see' how it has happened.

http://en.wikipedia.org/wiki/180_degree_rule



As for editing to music, well this is where those long hours editing come in - I dont have a particular talent for music vids so I just keep on plugging away until 'wham' there it is - you know when it works. I dont think there is any formula for something that is really an art.

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