Fake chord notations qualify as a bona fide "living language".

As such, the compendium is dynamic and is growing constantly as needs arise.

New additions to the chord compendium are not nonvalid, by any means.

If the new addition turns out to be easy to recognize by the majority of musicians and if the type of chord notation that the new addition catches on as a chord sound, then that new addition, such as the X2 chord mentioned here, will likely "grow" to become used in all genres that use fakechord notations.

It is interesting to notice that the Pop genre has been leading the way for the last couple of decades or so, there is also a bit of "crossover" influencing the situation, I think.

When penning a chart, it may become necessary at some point for you to have to actually come up with a new fakechord designator. The "rules" here are natural -- if what you pen is easy for musicians to grasp what it is, follows as much of the "convention" of rules for fake chords that has preceded it and is needed in more than just "your" song, it may someday end up as part of the compendium. Or not.

Fake Chord notations have also historically been known to be location-centric. For example, "West Coast Notation" was once used to describe certain Pop fake chordings that jazzers on the East Coast wanted to belittle as not being "real". -- Until one or two of thier own started using them. See Herbie Hancock and his use of the "Pipe" chord notation...


--Mac