MI modes vs Grimoire modes

[lydian]

ok well, a while back i got the guitar grimoire, and i learned all the scales in all seven modes, so i was thinking cool, i'm understanding modes. now a few weeks ago i got a musicians institute book about modes, everything was going fine untill i looked at the ionian paterns. there are only five, and i am at a loss as to why. my friend said that since MI uses two note per string paterns (as apposed to three note per string in the Grimoires) they combine two of the paterns. while this could make sence to me, it still doesn't, this is a real music school, and there going to just leave out two modes? just doesn't seem right.

some input would help

~

[lucacelano]

I imagine the MI book uses the CAGED system - there will be a C shape scale, and A shape, a G an E and a D shape scale for each of the major modes. This means you have 5 scale shapes for Ionian, Dorian etc allowing you more coverage of the neck. They arn't leaving out any of the modes because you have 5 shapes for each of the 7 modes.

[lydian]

isn't there suposed to be 7 notes in the major scale though?

[Norcal_GIT_r]

I'm not familar with Grimoire patterns but I'll bet the difference has nothing to do with the actual notes, but the postitioning of the patterns.
If you spread your pattern to cover 5 frets instaed of 3 or 4 you'll have less patterns.
Take the same C ionian pattern from both books and write the actual notes out on paper and I'm sure you will find that both patterns contain the same notes.

I know for a fact that you can trust MI material for learning.
I'm an MI grad, and I studied music theory in college before going to MI and I can say that MI teaches the actual modes as they have been studied for centuries. I cant speak for the other book as I have not used it.

[lydian]

the thing that confuses me is that there is only five notes before the octave. isn't that a pentatonic pattern? they are combining/taking out the half steps/modes. ie locrian and mixolydian.

[Norcal_GIT_r]

Without seeing what you are looking at I can't comment on the patterns.
Here's a quick run down of diatonic modes in the key of C Major

The key of C major C D E F G A B
Mode 1. C Ionian C D E F G A B
Mode 2. D Dorian D E F G A B C
Mode 3. E Phrygian E F G A B C D
Mode 4. F Lydian F G A B C D E
Mode 5. G Mixolydian G A B C D E F
Mode 6. A Aeloian A B C D E F G
Mode 7. B Locrian B C D E F G A

Here all the notes you need to learn the modes in the Key of C.
Once you learn the patterns you just need to transpose the whole pattern to the root note you want to play in.

Also notice that the Ionian mode is a regular major scale and Aeloian is a regular minor scale.

All diatonic modes are 7 note scales. You can break up patterns into 2 note, 3 note, 4 note per string depending on what you want, but it's always 7 notes to a mode.

Hope this isnt too confusing to you.