A good introductory website

Countries and ethnic groups:

Cultural notes:

Music genres and characteristics:
Here is a list of types of traditional Japanese music:
Gagaku is the oldest type of traditional Japanese music.
Biwagaku is always played with a Biwa.
Nogaku is played sometimes with choruses
Sokyoku is played with an instrument called a Koto. It has 13 strings

One of the Japanese traditional instruments is called a Biwa. It is sort of played like a violin but it looks like a guitar. Click Here to see a picture of a Biwa.
some of the most important traditional Japanese music is drumming.

Videos and sound clips:Here are some samples of some Japanese traditional music.Here is the same person playing a different intrument called a Kokyu.