The chord diagram say that 5th string shouldnt be played while playing CMaj7 on E string. But, I couldnt help but notice that in an online lecture I have been following, all 6 strings are strummed for CMaj7. I am finding it hard to understand why 5th string is being played. Note ‘A’ is not part of the chord. CMaj7 with root on 5th string makes sense, all strings except 6th string should be played. Kindly help, how can I strum while playing CMaj7 with root on the 6th?
I think the confusion came when you saw someone strum all six strings. That is what they did. What they didn't was press all six strings down hard enough to sound. They muted any string with a 'X' shown. In fact, this chord window is only one option. There is actually no need to not include that string, pressed on fret 10.which makes fingering a little fussy.
Bit of a duff lesson if muting wasn't mentioned !
This is a very poor voicing, the tonic high C on the 1st string creates a dissonant minor 9th interval with the major 7th B on the 4th string, a major no-no for a major 7th chord. The best way to play this particular chord is to not play the 1st string by muting it with the first finger.The first finger can mute the 5th string as well.
If you really want to play a note on the 1st string then diagonally bar to the 1st string 7th fret with your first finger. Then you will be doubling the major 7th B an octave higher. The 5th string should still be muted though.