b. Are these chords in the song less than 10? (or possible to decrease?)

We should count each chord in the song even if it’s similar like「G」and「G7」[Bm7] and「B7].

Make sure you practice and understand these chords, A, B, B7, C as well as the things related to the Gray Room.

Songs with more than 10 chords are not appropriate for beginners or the QactusCore-Method. Please choose songs that have less than 10 chords, if possible.

When choosing songs, please keep in mind that beginners on average can play 6 to 7 chords in an hour even if the song was arranged using the QactusCore-method.
Make sure keep that in mind whenever you try to choose some songs for beginners.

People without any previous experience on any musical instruments can be confused if they face more than 10 chords.

However, it can't be denied that some beginners are really eager to try a song even if it has more than 10 chords.
Keep trying to explore the capability of QactusCore for some beginners who are eager to play a song with more than 10 chords.

Continuing reading to find out more tips for problems likes these.

Now, lets return to the three rooms(Yellow, Red, Gray).
You might be able to decrease the number of the chords in the song if you use the rooms to divide the chords. You can ignore the Gray Room.
However, keep in mind that sometimes the Gray Room can help to decrease the number of chords. You should study musical theory if you'd like the freedom to use the Gray Room to decrease the number of chords for beginners.

Just keep reading this page if you don’t want to study such hard books.
Everything will be just fine.

Stage-3『Special Lecture』
Stage-3『c. Does the song change key often or just sometimes?』