DEFINITELY NOT A MUSICAL.
It's a concert, no other way to describe it. There is no stage props, no extra, the band is on stage and interacted with, and most of all its the six wives just hyping the crowd up befor each song starts.
There is minor dialog and jokes thrown around but, that hardly justify calling it a musical.
Lights and a staircase is there only way of portraying any kind of scene. It's just a concert.