Ok - I see what they're saying.
But first - a simple fact.
If you play a song and then put a capo on and play the SAME chord shapes - the key will definitely change. It will change by one half step per fret.
What they are saying is that if you put a capo on and want the key to NOT change, then you will have to change the chord shape accordingly
For example: You want to play a 12 bar blues song in the key of F because you can sing the song well in that key. So you start off with the chord F and whichever other chords follow.
But then you decide that F is too difficult for you to hold. So you put a capo on the first fret, and play an E chord , which you can do easily. It looks like your playing a blues in E now, but really you're still playing it in F because the capo is automatically converting it back to F. The capo is just like your index finger - converting your E chord to an F chord - or any major chord depending where you want to place the capo.
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