There are some exceptions such as triplets, tuplets, and adding half of a note's rhythmic duration with a dot. But the fact still stands that rhythm is treated as divisions of each other.
The way rhythmic duration is counted in Melbourne Music Theory is not based on a system of division, but of addition. Divisions are also possible, and I will get to that later in the article. But for now, understanding the progressive duration of rhythm according to units of duration will lay down the basics of the system.
As MMT aims to be a descriptive and discretionary theoretical music framework as opposed to the prescriptive and systematic framework of traditional theory and notation, time signatures are seen as unnecessary much like key signatures in MMT. I believe that when the musician is free to discover how things sound and feel for themselves without tonality and rhythm being dictated, that more musical freedom and control is achieved.
MMT uses the same symbols as traditional notation, but they are assigned different values. Here is a table that shows the base values, which can then be modified in various ways to add and divide them as I will address later in the article.
And this table demonstrates how by adding +1 or +2 units of duration to a note gives us a spectrum of notes that rangs from 1 to 18 units of duration:
Much like traditional notation, notes can be tied together to achieve greater duration.
As mentioned previously, notes can still be divided and even multiplied. This is done in a similar fashion to how tuplets are traditionally given a bracket over the notes and a number that shows how much to divide those notes by. The symbols used for division are as follows:
The reason I chose these symbols in particular is quite transparent. The symbol for 1/2 is simply a circle split in half. The symbol for 1/4 is a circle quartered. The symbol for a triplet division is a Y, which looks like three even spaces divided by three lines.
Having these modifiers means that when using notes that are only one unit of duration, you can continue to divide the note so you're not left with a duration of 1 as the smallest unit available.
There are modifiers for multiplication as well. The maximum note available is a dotted semibreve which is worth 18 units of duration. With these modifiers, an even greater rhythmic palette is achieved.
These are the basic explanations of how all the rhythmic counters and modifiers work within MMT. Combined with the system of pitches, intervals, and their positions on the stave, this makes a complete system of notation and descriptive music theory for musicians to discover and create music in a purely discretionary manner.
In the near future I will make some videos, and potentially some exercises to help one acquaint themselves with MMT. I will also cover the benefits of using MMT as opposed to traditional theory and notation in the next article.