This has been a bit of a thing with flowglow, but I'm surprised that they haven't really tried making entire gens themed/focused on various different music genres. Flowglow is kind of meant to be rap focused, but their music is still largely just idol music.
I want gen units that do not play "idol music but with a slight lean towards something". I want them to actually play a different genre. An entire jazz gen. An entire metal gen. An entire disco gen. An entire blues gen. Etc