Qactus

QactusCore-method

Contents

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STAGE-1

2. To Calculate Particular Musical Notes From Chords

Most chords are basically three notes.

The sound you play is going to harmonize as long as these string notes belong to the chord constituent.

We can imagine the musical notes from any chords if we have some knowledge related to musical theory.

Don’t worry, we can calculate particular musical notes from chords with this chart「Decoding Table」.

【QactusCore-Method】コード解読表

We will learn how to use this decoding table.

At first, pick a simple chord.

[Em]  will be a good example if you don’t have any ideas.

    First, use the decoding table to divide the chord into it’s harmonizing notes, follow these steps:
  1. Find [E] in the Yellow Room, (hint it’s the 8th column from the left).
  2. Now find the [m] in the Red Room, (hint it’s the 2nd column from the left). Next, use the decoding table to find the particular marks between the two rooms (Yellow and  Red), follow the last step:
  3. Match the marks in the row from the Red Room’s [m] column with the notes in the row of the Yellow Room’s [E] column.

Just to let you know, the correct answer of the sample 「Em」 is 「E, G, B」.


That’s it for now.
It’s easy if you can find the notes on each line carefully.


We are going to practice, OK?

Try to find particular notes that harmonize in these five chords.

    Question
  1. D
  2. F#m
  3. Bm7
  4. Am(♭5)
  5. Gdim

By now, you might have noticed that there some challenging exercises in this set of chords. This is for you to practice so that you will be able to perfect it and for you to improve your skills.

Let’s do these, in order.


Q1: D

The chart in the Yellow Room has 「D」 in the 6th column from the left. On the other hand, we need to choose the 1st column named 「none」 in the Red Room.「D」has no mark in the Red Room.


Now, let’s find the crossing points with the rows in the Yellow Room’s D column with the marks in the row from the Red Room’s [none] column.

[D, F#, A]  are exactly the notes that harmonize with this chord.

【QactusCore-Method】chord

Q2. F#m

Now find [F#] in the Yellow Room and find [m] in the Red Room.
(Turn back to [1.chord] to read again carefully if you are confused with this part)

[F#] is in the 10th column in the Yellow Room and [m] is in the 2nd column in the Red Room. Find the crossing points between the rows in the Yellow Room’s [F#] column and the marks in the Red Room’s [m] column.

「F#, A, C#」 are the notes which can harmonize with the chord 「F#m」.


Q3: Bm7

It seems we are going to face a tricky question.

The Yellow Room has [B] and The Red Room has [m].
But where do we find the remaining [7] ?


Remember the Gray Room we told you to ignore? This is where we find [7]! In the Gray Room!
(Turn back to [1.chord] to read again carefully if you are confused with this part)

You can ignore [7] for now. Let’s see the crossing points between the rows in the Yellow Room’s [B] column and the marks in The Red Room’s [m] column.

「B, D, F#」 are the notes which can harmonize with the chord 「Bm7」.


Q4: Am(♭5)

We don’t have to think about it complicatedly even if it looks like a tricky question.

Find [A] in the Yellow Room’s columns and find [m(♭5)] in the Red Room’s columns.

「m(♭5)」looks a bit weird compared to others but it’s one of the options for the Red Room as you can see.

Now, let’s see the crossing points between rows in The Yellow Room’s 「A」column and marks in The Red Room’s 「m(♭5)」 column.

「A, C, D#」 are the notes which can harmonize with the chord 「Am(♭5)」.


By the way we have so many cases to add 「7」 onto this type of chords like 「Am7(♭5)」.
「7」is「7」even if the chord is out of order.

It will be ok if you can imagine this kind of chord 「Am(♭5)」with [7] removed.


Q5: Gdim

This kind of chord is much easier than we think even if it looks tricky. It’s fine if you just divide it into「G」and「dim」.
However The Red Room has 「☆」as you can see. Actually this is a trick question.

Remember that「dim」is an exception and is unlike other chords because it’s a bit special.
The four 「G, A#, C#, E」includes the 「☆」 and are the notes which can harmonize with the chord 「Gdim」.
It will still harmonizes if you remove 「☆」 or 「E」to change Gdim into a three note chord.

It will become the same chord notes with 「m(♭5)」but it's ok because the aim is 「finding the notes which can harmonize」.


You can ignore 「☆」if you are going to be confused.
It will be much better than giving up.

Just try to use this chart like the way of The Red room if you can.

【QactusCore-Method】gray room

We are going to skip the explanation about this chart because we already learned how to use it based on how to use the Yellow Room and Red Room.
You are allowed to ignore 「The Gray Room」to avoid being confused if you are going to lose your way.


Now, we have learned how to find particular notes using this QactusCore-Method and the 3 Rooms.


Stage-1『1. Chords & the 3 Rooms』
Stage-1『3. Keys』

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