So the main part is in G major, a I-iii in a clave with a V-vii° turnaround. then in the last V-vii° the root goes down a half step, to F, which is the V in Bbm (which is what it modulates to). It's just a simple i-V for like 3 bars, with a beat removed to make it interesting. Then there's a turnaround that was inspired by the Dameron turnaround that I tried to do in minor (the dameron turnaround is in major so doing it in minor was kinda weird). Then it goes back to the I-iii (with the V-vii° turnaround) part