It seems to me that there’s a fairly common trope used in popular music where the first verse or so of a song has a low-profile or no rhythm section, and then, coming into the second verse, the rhythm that is to continue for most of the song comes in with a noticeable “oomph!” even though the tempo stays the same. Does this have a name?
We do stuff like that all the time in my band. I don’t know of an official, technical name for it - although I am curious if one does exist. We just call it “doing a build,” as in “okay, I’ll start alone on guitar, and then you build on that on bass and finally the drums kick in…”
The Introduction to the Moment of the Heat of the Moment 
The Phil Collins Effect.
/band name!
thwartme