This isn’t so far from what I was making 10 years + ago. I decided I was going to try to make something like this, as I do like it a lot, because of this thread.
As others mentioned, the right samples play a huge role, e pianos, Rhodes, funky bass and guitar are present in everything I’ve heard from these guys. Also in some cases, classic house and disco acapellas, which I am not sure if they are licensing those or not for their apparently vinyl releases.
Lots of swing on the hats, plenty of delay everywhere. Analog bass or real bass guitars… No big risers, no crash cymbals or at least I don’t remember hearing any yet. It is all very subtle but effective.
Regarding music theory, lots of jazzy chord structures, add9, 7ths, 11ths, all fair game here. Will try some parallel chords later to see if that works but don’t see why not!
Will report back with a link to what I managed to do it you’re interested or if your think it is best done through private message due to forum rules (which I know nothing of), please let me know. I should have the track ready later today.
Hope this helps!