Understanding keys in music is something beginners often overlook. Whether it’s because they feel it’s too difficult or they just don’t have a need for it I’m not sure. One thing I am sure about is that without some basic understanding of musical theory and how keys work you’ll plateau as a guitar player.
In this lesson I’m going to provide you with a primer on musical keys, how to find the right chords that “fit together” in a particular key as well as provide an example. After reading this article you’ll be able to start figuring out keys for yourself.
What is a Musical Key
The definition of a musical key can get complex. The easiest way to say it is that music in let’s say the Key of D is harmonically centred on the note D major and also uses the notes inside the D major scale. So to fully understand the notes/chords in the Key of D major we must refer to the D major scale, but don’t worry it’s not every note you’re going to be playing. Some sound better then others.
Finding the Right Chords in each Key
There’s an easy method to find the best chords to play together in each key. The method is known as one-four-five, some times written with roman numerals as I-IV-V.
This pattern refers to the note numbers in a given scale. So in our example above in the Key of D major we would refer to the D major scale and pick out the first, fourth and fifth notes that occur. These notes would be the one, the four and the five of the Key of D.
Example in the Key of D
The D major scale looks like this:
D E F# G A B C# D
So from the D major scale we can see that our one is a D, four is a G and five is an A. You can play those notes from the scale as chords and you’ll have a great sounding chord pattern in the key of D.
Watch the following video for some more insight into the I-IV-V pattern and another example.
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