I doubt a five-year-old would understand any of these comments. Let me try:
All musical chords are made up of three notes. When it’s just a regular chord, like C or G or A, one of those notes will be the same: a C note or a G or an A. This is called the root note.
The easiest way to turn the regular chord into a seventh chord is to drop the root note two steps — that is, two keys on the piano (both black and white), or two frets on a guitar, etc. All the other notes stay the same. So for an A chord, you drop the A note two steps to G. To get G7, your drop the G note two steps to F. For C, however, you drop it to B-flat, because in the major scale, that is two steps.
So the reason 7th chords all sound the same is because you are doing the same thing each time: dropping the root not two steps.
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