Public Wiki Directory Categories

When asked to list your wiki in the public wiki directory, you are given a drop-down menu to choose a category. I would like to choose "Music" but it is not available; neither is "Art" which would include the visual arts as well as music. Also, I found it difficult to find a way to post this question and the GetSatisfaction avenue makes me register with pbwiki for a third time with another email and password combination.