The biggest issue is by technology.
Ok first of all, you should know the clefs bottom one is bass clef and top one is treble clef. so the lines are called a staff where you put the notes and everything.
is this what you were asking for?
The system which was in practice was the Shogunate system. It was between the two restorations and was about Shoguns who were military leaders. The period was marked by sever isolation and it ended during the Meiji restoration when the Shogunate ended.
