I wish more songs did what you did in la de da during the end of the chorus, mixing up the progression of the chords and adding a nice twist is there a specific name for this technique?
i call that a 'duck' because ducks have a head, which is a very special thing that is only at one end. this is actually very common in music but it might have fallen slightly out of use in the age of computers, because it has become technologically easier to just loop the same chords forever, which has its advantages, but that in turn gives you and me an advantage if we do so choose to impliment duckification