I don't know how many people use the "tags" dropdown menu in catalog view. It seems like a great way to discover new music, but I find that most of the categories have are missing a ton of songs that would fit nicely, and many of the songs under certain tags just make no sense. As it stands it seems next to useless.
I think it would be nice for listeners to be able to add tags to each song as it comes out, and if enough people add a certain tag, the song will get that tag.
Otherwise I see no use for the menu being there.