The midi file that is listed above is in the key of Ab. The beginning is in F minor, and starts on an Fminor chord. Then it opens to a B minor chord which resolves to the F minor--it does that a couple of times. Then it modulates to the Eb7 chord which eventually resolves to the Ab. It does that a few times. The babalu aye part is bounces from Eb7 to the Ab.

I am fooling around with the midi above, which, thanks to Haruo, I got.
I am mostly editing the voices so it doesn't sound so dippy. The instrumental parts themselves are actually really good