This crowd-sourcing question comes from my friend Loren Kajikawa, a music professor up at Oregon.

[we] are searching for the earliest source of that cliched bass turnaround–the part where it drops down and then works it’s way back up by half-steps.

In other words, they want to know the origins of this sound:

Disco Bassline examples (3 in 1)

So…anyone want to help figure out just where this began?

To me, it sounds like something you might have heard on piano in ’60s Latin music but maybe that’s just my overactive imagination.