woah, exile's has sold over 1 million?! they arent even good, i think the main singers voice is *awful* >_< the only song i enjoy by them is choo choo train, haha! but ayu's still doing well. she's not at her peak anymore, so we cant expect AMAZING sales
exile and kobukuro are both probably at their peaks right now, which explains the high sales.
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"Remember, don't let others dictate your music taste. If you like whatever you're listening to, keep listening to it."