In this example, the search results refer to the hymn "Hail to the Lord's Anointed" as a Psalm response. That's silly and misleading; only a very few of the 700-plus instances are responsorial. Almost all are complete hymns/metrical psalms. Montgomery certainly didn't write it to be used as a response. It is a psalm in its own right.
The same kind of error happens with tune names, but I don't have an example in front of me.