I'd like to find a database that can be used to answer questions like these:
What antiphons are used with psalm tone 4d? Is that tone only found in old publications? (or What is the publication date of each?) In those publications, what percentage of mode 4 antiphons use tone 4d?
Does GregoBase have any search features that can help with questions like these? Are there other resources that might help?
Does GregoBase have any search features that can help with questions like these?
No.
And the other chant databases available are concerned with medieval sources, not with modern editions. (There is one dealing specifically with differentiae / psalm tone endings: https://differentiaedatabase.ca/ )
I have the GregoBase db dump and some other publicly available datasets imported in a private chant database (source code https://github.com/igneus/adiutor/ ). It can provide some answers, but is very much limited by the data available. Reliable answers would require much more extensive and systematically prepared data.
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