Has it been considered to use an already established standardised freely available taxonomy for this database instead of reinventing the wheel?
There are quite a few around.
Examples are the Library of Congress subject headings, which are quite detailed, maybe too much for this site, I don't know?
Also the Library of Congress genre terms for fiction works:
These examples are used by most libraries in the English speaking world.
Just thought I would throw it out there for discussion.
On the same topic have tag clouds been considered for any of the new databases considering all the debates that go on regarding genres at discogs?
Thanks for this suggestion. I'm going to discuss it with our team.