Famous sci-fi and horror themes played in major keys turn them into uplifting new age dreck

The problem with that one lies in its multi-instrumentation.
To make a decent scale-shift on any tune it’s best to use a tune with only a single instrument, or convert the multitrack stems (if available) one instrument at a time.
If you have the stems (or a single instrumentation) then Celemony’s Melodyne makes it a pretty straightforward task.

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