- F4
- C4
- G3
- D3
- A2
- E2
In other words, GMT puts adjacent strings of the guitar in a consistent relationship of a Perfect Fourth. This is the way basses are tuned.
I don't remember where or when I first heard of the idea of tuning a regular, six-stringed, electric guitar in consistent intervals, but I have thought it would make more sense for single note improvisation for as long as I have been casually interested in Jazz (about 15 years). Here is the compromise in a nutshell:
- GMT
- Pro
- Consistent fingerboard shapes
- Far fewer shapes/fingerings (a small fraction)
- Requires far less cognitive bandwidth while playing
- Promotes much more direct relationship of ear to instrument
- [Facilitates a fresh approach to the guitar]
- Con
- Nonstandard
- Puts more tension on already overtaxed first string
- harder to perform some common 4- to 6-note chords
- [Lose much of your existing repertoire]
- Standard Tuning
- Pro
- Standard
- Good for solo music (classical, jazz chord melodies a la Joe Pass)
- Con
- Requires many many times more shapes per musical item
- More thinking is required while playing
- Clutters musician's mind with lots of para-musical memorization
- Encourages position playing and other non-musical tendencies
- Generally obscures the connection between a musician's ear and instrument