If Proposal: A little harmony fails, so does this one.

Rename the GNDT column Style to “Harmony”.
Replace the rule Harmony with one named “Style” with text:

Each Musician with an Instrument may be playing in a certain Style. Style is tracked in a number of GNDT columns listed below, with the values given below, each column also having the value “-”. All GNDT Style columns of any new Musician are set to “-”, although this is not a Style value. A Musician with no Instrument must have all GNDT Style columns set to “-”, from which they cannot be changed as long as that Musician has no Instrument; this take precedent over the rest of this rule.

Styles may change manually or automatically (i.e. as the result of other changes) as described below. All the automatic changes that happen as a result of a manual change occur before another manual change may take place. If a change immediately leads to more than one automatic change, all such automatic changes happen simultaneously. Automatic changes can lead to more automatic changes and so on, until a state (the set off all the Musicians’ Styles) is reached where no more such changes are required. If, in a sequence of changes, the same state is reached twice, the changes cease having an effect, and no more automatic changes occur until after a manual change. For instance, suppose someone makes a manual change from state A to state B. State B leads automatically to state C, which leads automatically to state A, which leads automatically to state D, which leads automatically to state C. Here it stops, because C was reached twice.

In this rule, any implied ordering of the Musicians is the order they’re listed in the GNDT.

The Style columns and their corresponding values are as follows:

* Harmony. Values: Consonant, Dissonant. The Harmony of a Musician immediately between two Consonant Musicians becomes Consonant. The Harmony of a Musician immediately between two Dissonant Musicians becomes Dissonant. Any Musician may often change eir Harmony.

* Tempo. Values: Allegro, Moderato, Adagio. If a change of Tempo occurs resulting in three consecutive Musicians playing at the same Tempo, the middle one’s Harmony becomes Consonant. If a change of Tempo occurs resulting in three consecutive Musicians playing at three different Tempos, the middle one’s Harmony becomes Dissonant. Any Musician with Dissonant Harmony may often change eir Tempo.

If Proposal: No Air Guitars fails, remove the text “with an Instrument” and the sentence beginning “A Musician with no Instrument” from this rule. If Proposal: A little more harmony fails, remove the Tempo bullet point from the list in this rule.

This doesn’t change the mechanics, aside from renaming Style to Harmony. It just settles certain ambiguities and allows for easier additions. Sorry it’s so long, but it should help keep future additions shorter!