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I think that in order to be more "mainstream" sounding, they can't really do the more fun/goofy type of songs... they've gone for a more mature style now, and the average age of the girls is higher than in earlier times... if they add in younger girls 9 Gen, then I can see them doing more singles that are more genki. Not that I don't love those kinds of songs, I just don't think that they work with the current line-up.
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