For the example about beginnings, I chose the Star Trek (2009) Theme, found here:

https://www.youtube.com/watch?v=EO1FZEUbZJE

From time 0:00 until 0:38 the music starts as one soft melody, which, as the piece continues, gets more layers added to it that exemplify the expansion of range introduction concept by increasing the layers to higher and lower registers. The layers, starting at around time 0:18, also have a very noticeable increase in volume, as the introduction at time 0:00 is very soft, and by the time the main melody begins the music is very loud.