There is a common technic used in orchestration across all genres of music. Sometimes in the second verse or before the singer is about to repeat another part in the song there is a move usually up in scale that brings a sense of a fresh beginning. I've heard some orchestrators come back to it and in some instances, in the end, there is a constant move of scales while the song is fading out. Does anyone know how is this referred to in orchestration, and if there is a rule or a guide to determine the next scale in movement? Thanks.
I think you're talking about the 'truck driver' modulation. PLay it, then play it again, up one step!
A composing/arranging technique more than an orchestration one.
Here's a fun take-off of the technique!
This is called modulation, and it is a very common technique for changing the feel of a piece. Very loosely speaking, a modulation toward higher pitches adds excitement; a modulation toward lower pitches calms things down.
There aren't exactly rules for determining the "next" scale, but there are some common techniques. One of the most common is to move upward one step (at a time). This adds energy to the music more gradually.
Another possibility is to do a more abrupt modulation to show off the soloist's/lead singer's range. A song might start in the singer's mid range but suddenly modulate upward so that the singer is belting at the top of their range.
There is an excellent (but somewhat technical) discussion of the various ways to modulate in How many types of modulation are there?.