recommendations are:
pornograffiti: They're amazing, they've been around for ages and i still never get tired of it. They're very much pop-rock.
Remioromen: ballady soft rock with an amazing voice.
Joe Hisaishi: instrumental, music choreographer to most of the Ghibli films. Always always calms me. I know, its not particularly upbeat but Hisaishi-san probably one of my favourite [japanese] composers.
K- korean/Japanese singer, his voice never fails to haunt me and send chills up my spine. He;s not japanese but from the singles i have heard, they're japanese. I recommend his new song: birth of treasure.
Miyavi, Gazette, Vidoll, nightmare and
Ancafe are obvious [really good] recommendations.
orange range are just catchy
