While listening recently to Donna Summer's 1989 comeback hit, "This Time I Know It's For Real," a realization struck me; I don't think I've ever heard any radio station play Rick Astley's 1988 hit, "Never Gonna Give You Up," before or after it. That surprises me, as they're rhythmically similar enough to flow back to back.
In their original versions, Summer's tune is only a smidgen faster than Astley's, which serves the pairing well in either order.