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Okay, so I know this video is heaps short and this is yet another theory video, but I happened to stumble across an old Disney cartoon on here (YouTube) calledd Mickey's Choo Choo and noticed that one part of it sounded like the Twentieth Centurie Fox intro thing.
Link to the videos can be found here:
Old Disney Cartoon "Mickey's Choo Choo" -
Twentieth Centurie Fox Theme -