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Chord Substitution is common in our music today.
We can replace a chord with another related chord.
Often the substituted chord differs by one or two notes from the original chord.
Before you read this post, it will be good to take a look at my previous lesson -
Introduction to Chords SubstitutionFor example, we can replace an Am7 chord with a Fmaj7 chord.
The notes in the Am7 chord are: A C E G
In the Fmaj7 chord the notes are: F A C E
There is only one note difference between these two chords.
If we have an Em7 chord, we can replace it with a Cmaj7 chord.
You can also replace the Em7 chord with a Gmaj7 chord.
The notes in the Em7 are: E G B D and G B D F# for Gmaj7.
Again the difference is only in one note. You can call this a relative chord.
Hope this helps.