Each publication is assigned a unique catalogue number.
You can now put catalogue numbers in the search window.

This is a real help for those who have difficulty with obscure titles.  For example you could search for “Grillo: Canzon Terza à8 (1618)” or just “Canzon Terza à8” or, if you already know the catalogue number, “ADC17”.  Try it.

Option: There are some cross references which may find irrelevances or serendipitous surprises depending on your curiosity level.  To avoid these in your search, prefix a “#” hence “#ADC17” and that should ensure that your search is properly focused.