@LyricsLover: If I may, I would like to revisit your two proposals, as I was only able to test them for the first time, today:
Pending further applications, the first artist I searched for, was "Mary Duff". Both sources returned for this query the artist's name only, i.e. excluding their surname. Can this search tool be further refined to take care of such instances?
These are the two respective landing pages for the "Mary Duff" search:
or you can do the same as for your initial allmusic query and replace a space in the ARTIST tag with + character for the search query: https://www.discogs.com/search/?q=$replace(%artist%, ,+)&type=artist https://musicbrainz.org/search?query=$replace(%artist%, ,+)&type=artist