War: (
Story/Location) Titles of this category should cover the events of a war as significant element of the storyline (even if the actual conflict doesn't get that much airtime). The opponents should be nations
at least (alien races, star systems, parallel universes etc. are fine as well); conflicts between smaller organizations would rather be categorized as "
Fighting".
Music: (
Story/Location) If a title deals with music as significant element of the story, and / or the lead characters are musicians and this is significant for their role in the story, then use this keyword.
Idol Project is a story about the pop business,
Aquarian Age is a story about a rock band,
Rahxephon is about using music to 'retune the world' - they all belong into this category.