You have put a great amount of work into this database and it is an amazing resource. My congratulations and thanks to you for your contribution to the world of music research.
A quick note -- the link you provide is set as an email link rather than a web link. Perhaps you can edit the link. In the meanwhile, we can copy/paste the text of the link into our navigation bar to get to the site.
I have one usability recommendation -- the main graphic is very large (250+ kilobytes). It loads slowly and must reload on every page. If you reduce the pixel count to something like 72, it will load much more quickly.
I have one recommendation for improving usability of the database. It is currently displaying results back and forth across the screen like this:
Aa Ab
Ac Ad
But most people tend to "expect" the natural order to be in vertical columns, like:
Aa
Ab
Ac
Ad
Yes, this makes longer pages, but it is easy to create a quick navigation at the top of each alphabet, like:
Aa Ab Ac Ad [linked to alphabet sections lower on the page]
Aa
Ab
Ac
Ad
Of course, we are happy to have the database in ANY format. It is so comprehensive. And I think all of us are smart enough to navigate the site, even if you arrange it backwards and upside down. So, this is not a real "problem" with the site.
Thank you again for creating this useful database.