UPDATE:

I batch converted over 6000 archived songs of the former Wikifonia Sheets to .PDF Format in alphabetical order, by song title. You can browse /search, and download individual sheets, or download two complete (very large) folders, The .PDF sheets are all in the default key of the creator.

Also, still available are the Wikifonia sheets .XML Format in alphabetical order, by song title, for editing in programs such as MuseScore (free)

That's it...