"Mainstream" hot bands in Japan right now:

Official Hige Dandism,  Kenshi Yonezu, King Gnu, Aimyon, Wanima

My Personal Picks:

Polkadot Stingray, eill, Mrs. Green Apple 

Japanese words:

髭男 (hige-dan): bearded man

米津玄師 (yone-zu-ken-shi): his REAL name(!!)

緑黄色社会 (ryoku-ou-shoku-sha-kai): their band name

緑黄色野菜 (ryoku-ou-shoku-ya-sai): brightly colored vegetables

*野菜: vegetables