"The number system facilitates individuality and re-interpretation, and yes, it's okay to use as many tools as you have at your disposal to learn music: Ears number system, sheet music, chord charts, tablature, whatever you have, try to use as much of it as is useful."
Sketchman: WELL SAID!!!!!
No problem we all here to learn! Well 1st the number system is a great way for musicians to communicate but when the music get more complex (outside of the scale then what?!!!!!! I don't know if you've ever heard of secondary dominants but we use them all the time! It's when you substitute a dom7 chord in a spot that doesn't normally belong! Everybody knows the 3 of the scale is minor but what if your passing to the 6 when normally change the 3 to major/dom7 how can you explain that to someone while playing....at least I can't lol also what if the chord is a 1 but the bass note is on the 3 how can you explain that to the band mid song!!!!! As far as chords, you do use numbers to spell out the chord I may have worded what I was trying to say wrong!
I understand that mid-song it is difficult to explain a secondary dominant, but I have seen it done just by calling out 2major, 6 major or something like that I have said 1 over 3 etc as we are rehearsing.
The issue I am taking up is the idea that in the process of learning how to play music one is limited if they learn the number system. Maybe everyone's idea of the number system is different. I don't think you learn the number system without learning a good amount of useful music theory. For example, I learned my scales, how to form chords, then progressions based on the number system. I was then taught how to get to each destination chord using various harmonic devices. I used my ear to identify chord quality as well. So when I got a lead sheet it may say 1-4-6-#5-6-3-4, but I still have to use my ear to know if those chords are major, minor, augmented, diminished, #5b9 etc. Then I can sub based on the melody note. It just goes on and on BECAUSE I learned the numbers. I can read music too, but my understanding did not come until I learned the number system!!!!