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1.
Short for "Japanese rock."

see visual kei
Popular mainstream Japanese rock bands would be Glay, L'Arc~en~ciel, Dir en Grey, Malice Mizer and Kagrra.

Popular Japanese indie bands would be +D'espairsray+, Vidoll, Madeth Gray'll, Merry, and Aliene Ma'riage.
by Christina February 21, 2004
 
2.
Japanese rock music.
I have a collection of great J-rock I got from Tokyo.
by Crono February 20, 2003
 
3.
Japanese rock.

Broad term that encompases any rock music from Japan. Visual Kei is a subgenere of Japanese rock music, not an alternate name.
Mainstream bands: B'z, L'Arc~en~Ciel, GLAY
by Arachne June 03, 2005
 
4.
Japanese rock.
by Anonymous December 22, 2002
 
5.
a music genre, also known as "japanese rock"
gackt, x japan, dir en grey etc.
by cuzza k August 16, 2003
 
6.
An excellent music genre that used to have a humane, mature fanbase only a couple years back. These fans still exist, but most of the fandom has been taken over by anime freaks which has ticked off most original J-rock fans. These anime fans only listen to Dir en grey (actually, some haven't even heard a Dir en grey song in their life) and claim to listen to Malice Mizer and Moi dix Mois, just so they can obsess over Mana who they clearly know nothing about (that sucks considerably, as Mana is a great, talented musician, not just a pretty face). They claim to be huge J-rock fans after only naming these three bands, yet have never heard of others like Amadeus, Boom Boom Satellites, Soft Ballet, or Blam Honey.
Another mistake they make is confusing j-pop groups with j-rock..
by nightandday July 29, 2006
 
7.
japanese rock
extremely good!
jrock bands are: glay, dir en grey, malice mizer, x-japan,l'arc en ciel, and many more
by Anonymous August 01, 2003