Warbird Information Exchange

Propellers, and lots of them: the Tu-95 and An-22 sound very similar.

Remember, those two Russian types have contra-rotating props on powerful turbines, with (presumably) higher tip speeds, so not quite the same thing as the B-36.

I've found any pusher has a bit of an odd noise.. Cessna 337s, Starships, Avantis...

Regarding the comment about C-124s, it would be interesting to compare its sound with a B-36. Same basic engine.
But two fewer and obviously not a pusher.

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For me, it sounds like a 'prop' noise, not an 'engine' or 'engine + prop' noise. A400M has an unusual sound too and I think that's a 'prop' sound rather than engine or engine + prop.

In fairness the contraprop point is well-made: the Tu-95 and An-22 had a similar vibe to the Shackleton and Gannet.