Roger,
this list is just three clicks away (or, actually four, is you read this).
click 1 (assuming you are on the main Forum page): Mudcat Cafe (upper left)
click 2: Search The Digital Tradition Folksong database
click 3: Select and Search From a List of Keywords.

Sounds easy, but it took me 10 minutes to refind it and I had seen it before!

Wolfgang