As I understand your question the song is not played (sung) the same way. You find several ways that the chorus, bridge and pre-chorus is played and or repeated.
That is quite common in a lot of music. The chorus can be repeated and come back to as many times as the mood dictates.
Follow the chords and keep on your toes so you know which way it is going THIS time.
In a lot of our music we notate in the margins how WE will play it. For example:
Tag last line
But, there is no guarantee it is going to go that way. If the vocalist or director feels the need they take the song as they feel it should go. Most of the time the verse, chorus, etc follow the chords, you just have to be on your toes as to which one is coming next and how many times it will be played.
It's art, not science.
Last edited by MalcolmAmos : 06-26-2013 at 06:07 PM.