1. Chords & the 3 Rooms

Don’t worry! This page is here for people who might feel frustrated.
Just follow this advice even if you have no knowledge of how to play music. This page will guide you.

If you need knowledge of chord structures then try to read some theory books which shows the system of chords.


First, there should be a note from A to G in the Yellow Room. Sometimes, “#” or “♭” may be added but the Yellow Room will never be vacant.

Other rooms may or may not be vacant.

To avoid confusion, for now we are going to skip some things which aren't so important.
As you can see in this picture, on the left side of the vertical line (The Yellow Room and The Red Room) are necessary information.
On the right side, the remaining one (The Gray Room) is something extra and we will go into this more later.

It will be fine as long as you understand The Yellow Room and The Red Room.
Based on this picture, we need to understand which symbol have to be followed or ignored.

Stage-1『0. In the beginning』
Stage-1『2. To Calculate Particular Musical Notes From Chords』