It could generate revenue, but you're going to have to drive traffic to your site and since Gregorian Choirs are not exactly mainstream, you're looking at a small number of possible buyers.
Build a favicon, add a small forum and eventually offer a few videos of Gregorian Choirs performing.
It's an incredibly difficult subject to promote since your target group is small, but a rewarding one nonetheless, especially if you've ever heard a Gregorian Choir in a church built in 1600