That bit I know from the Key Chord Chart I have.
Had to check what you mean by ‘diatonic chords’. According to Google it’s " A chord which is diatonic is simply a chord built from notes of the key . So in the key of C, the chord C major (C, E, G) would be diatonic to the key of C because its 3 notes are part of the C major scale."
I get that as that is the M-m-m-M-M-m pattern.
Thanks for your help with this but to be honest I find the whole keys, chords, scales thing confusing at best and can’t seem to make head nor tail of it. I have another Major Scales chart downloaded from the JG site that has T T S T T T S at the top which looks very similar to the Key Chord Chart. Where does this fit?
I started to go through @Richard_close2u The Circle of Fifths - where does it come from, where does it go? and got to part 4 0r 5 before it became a blur with too much to take in!
I know that the theory is that some notes sound better with certain scales but the other day I was playing a C major backing track (not realising that it was in C) and improvising using the A minor pentatonic scale. All sound OK to me!
Actually it wasn’t that long ago that I realised that the A minor pentatonic scale was not the Am pentatonic scale!! 