I can't offer any insight into the mystery of the Nancy Drew copyright, but seeing this thread did remind me of
this Tuscadero song from my younger days.
[Mods, feel free to delete the link if you think it's necessary. But the song is from a 7" single that's been out of print for 15 years, and I seriously doubt anyone from the band or label that put it out would have any issues with it being posted here.]