It is not important for every instrument that can play a chord, to play every note in the chord. In fact, if that happened, a lot of songs would be ruined.

To cite and earlier reference and to give the simplest example I can, think about this:

On the sheet music score, the pianist, or guitarist is playing C E G. We all should agree it's C Major.

But on the same score, the bassist is playing an A. Now it's an Am7

It can get much more involved than that, but this illustrates it.

It's not all black and white (except on the keyboard of the piano). laugh


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