The Japanese method is all about solfege singing. They get the kids to sing all the new songs in solfege before playing them. To the Japanese, solfege singing comes even before notereading. They actually learn by sound, until they`re mature enough to read notes. That`s why alot of Japanese kids are either definite or perfect pitch. Their ears are really sensitive due to this effective method. What they do during group lessons:
1. Sing songs in solfege. Teacher to sing one phrase, after which the student imitates.
2. Repeat this process and learn the whole song.
3. Learn to play the song, without reading the notes. Learn just by imitation of the ear.
4. After a few months of solfege training. They began to test the kids, and seperate them into perfect and definite pitch.
Test : Teacher plays Doh, Re, Mi
And teacher sings only Doh, Re, ?
As such (?), cueing the kids to listen for occassional notes and sing without teacher`s help.
Eventually the test will develop into :
Final Test : Teacher plays Doh, Re, Mi, Re, Do,( Teacher keeps quiet. No aid or prompting the kid)
And student to guess and sing by themselves all of the following notes.
So, as u can see, this training approach gets the children to register the pitch of each notes on the piano as fixed solfeges. And after some time, they`ll become definite pitch/perfect pitch. The thing about perfect pitch is that it`s actually inborn. But u do need guidance to bring out the best.
Sorry for this lengthy input.