https://www.youtube.com/watch?v=hdjL8WXjlGI&t=29s
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Loulie Jean Norman did the soprano wordless vocal stuff. Wikipedia taught me the technical term non-lexical vocables.
Norman delivered the non-lexical vocables over Alexander Courage's opening theme song for the first season of Star Trek. The music was remixed without Norman’s voice for the show’s second and third season so the producers could avoid paying her royalties.
I found YouTube links in your post. Here are links to the same videos on alternative frontends that protect your privacy:
Link 1:
Link 2: