Mecha: (
Story/Location) This is a genre of anime which features mechanical fighting machines. Often these take the form of giant robots but this isn't the only form mecha can take. There are tons of examples of mecha titles considering the popularity of the series.
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.
