I'm confused - standard major and minor chords are triads - any fourth note would be a repeat of one of the notes in the triad - or it would not be the standard major or minor chord. .. A guitar would probably be playing all three notes and a piano could easily be playing lots more notes but they would be 'doubled' as it were. What do you mean by four note chords? BIAB can 'play' lots of four note chords like a C7 - C,E,G,Bb.

I'm only a cowboy chord guitarist so maybe I'm missing the point.

Last edited by Bob Calver; 10 hours ago.