For once a male artist,
Taichi Mukai has a very special and experimental sound that mixed RnB, soul, electro and "odd sounds", and that combines melodic lines with jerky rhythms in a very fresh way in
Stay Gold or
Speechless. Note that some of his songs are more mainstream.
24 where you could find the mentioned songs.
Official website
Bed in is a female duet who parodies and revive the Jpop's golden age. You won't see skinny and cute idols but sexy women. Don't expect original music and just let's have fun with hers :
Official website