Find the right Keyes from given Tones (Accords).
If you want to know which Key is it, when e.g. your friend play the Accords E G A on rythem Guitar.
In this case E G A, the result Key is e.g. A Minor.
So you know, you can play a fine A Minor default Pentatonic Solo on your Guitar fret 5.
If you play so this will ever sounds perfect.

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