I've just started trying to see if I can adapt songs to the boogie woogie style, and I'm noticing there is a choice of how fast to play boogie relative to the melody. I guess I'm wondering if there's a terminology for referring to this difference.
What I mean is that you can double (or halve) the tempo of the boogie while leaving the tempo of the melody unchanged. (Or conversely, you could double/halve the tempo of the melody while leaving the tempo of the boogie unchanged.) For example, say I try to play "Leaning On The Everlasting Arms". The first phrase "What a fel-low-ship" could fit in one bar (and be counted 1, 2, 3&, 4), or it could take two bars (and be counted 1, 3, 1, 2, 3). If I play the former at 80bpm and the latter at 160bpm, then the melody proceeds at the same tempo. (A third option would be to sing "What a fellowship" in 1 bar at 160bpm, making melody twice as fast as the first two options.)