I agree with Chiharo, Corvina and Kachu. The Jpop world is very huge and diversified.
There are a lot of old singers we don't know because they were hidden by the popularity of some singers.
And it's the same with this era. Drop Oricon chart and try to search elsewhere. There are a lot of little music labels who produce interesting artists with different styles and even experimental styles. Those will never be included in the official and big charts or will never perform at a big TV show.
There are also singers who made mainstream songs to earn some money to create more experimental songs by themselves. Annabel is one of them. Her anisongs are very generic but her self-produce singles are unique.
And if you don't have time to search on Internet don't hesitate to check the new artist thread or the old school Jpop thread.
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