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Upcoming activities

Hermit Crab is now on bandcamp –;

on cdbaby –;

and on itunes –

Aside from playing shows, there are a number of projects and/or possible projects coming up – video production with award-winning filmmaker Kyle Armstrong; dance production with dancer/choreographer Nancy Sandercock –; and theatre production with director Sandra Nicholls, and writers Karen Wall and Michael Andrew.

That last one is a theatre production presenting a vision of environmental apocalypse. You know. Rising oceans and drowning cities, crop plagues created by genetic mutation. That sort of thing.

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Hermit Crab Bio

Hailing from the northern beauty of Edmonton, Alberta, Canada, Hermit Crab is the collaborative project between composer Dave Wall and the instrumental post-rock trio Gary Debussy. Using the classic two guitars/bass/drums rock band format, it combines the driving intensity of punk with minimalism and the harmonic sophistication of jazz. Noise, improvisation, and electronics are also part of the sound, creating a focused, exciting, and sometimes unpredictable experience.

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Placement of notes is crucial for producing metric tension. Generally, the production of metric tension means notes not lining up with the pulse.  Repeat the following example, and the notes in the top stave will line up with the downbeat of every bar, and nowhere else.


Does the next example hold more tension or less? Conventional thinking says that more notes equals more tension, at least in terms of rhythm. However, to my ear (at least in this case), less notes makes it  less predictable. Because of this, it holds more tension.



For someone else, it may hold less tension, especially if they’re hearing a composite rhythm instead of a metric relationship.

The measurement of rhythmic tension relies a great deal on number of notes. The measurement of metric tension looks at the relationship between pulse and the notes played against the pulse. Your experience of tension arises from how you are listening.

These examples highlight the idea of defining different qualities of tension, instead of defining tension based on quantity of material. Quality is almost completely subjective, however.

So how do we define rhythmic quality?

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Circular Rhythm

This image…

…informs much of my research. It’s pretty, but what does it mean?

Visual template

Essentially, it’s a template for visualizing metric and rhythmic tension. The outer circle shows four bars of the pulse in 4/4; each black dot is the ‘1’.


Moving towards the centre, the next circle represents the South Indian karnatic system (konokol) in 1/16 notes; each coloured circle indicates an accented note. More on the karnatic system in later posts.

1/4 Note triplets

The next circle is 1/4 note triplets (blue circles) against the pulse, and then 1/4 note triplets (red circles) superimposed against each two notes of the blue 1/4 note triplets. To do this, the blue 1/4 note triplets are conceptualized as a 1/4 note pulse then the red 1/4 note triplets are mapped onto that pulse in the same way that the blue are mapped onto the primary pulse (outer circle). Note that where the red circles line up with the blue layer, and you’ll see the 3:2 relationship.


The inner circle is a Turkish usul. Usuller (plural for usul), are rhythmic modes in Turkish makam music. The one that I’m using here is in 11/8. There are two ways to use this usul: as 11 against 4 (as used here) or as 1/8 notes against the primary pulse.

Each circle, then, holds a specific rhythmic personality. Different personalities can be inserted by using different konokol patterns, different usurer, etc. I leave it to your imagination to find these personalities.

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Tempo Levels

The consistently alternating dynamics in post 4…

… bring up and interesting perceptual dilemma. Namely, that they can be perceived as three simultaneous tempo levels.

Take the quarter-note triplets; simplify and repeat:

The notes marked forte can be perceived as downbeats, the piano notes as upbeats; this creates a half-speed tempo. While it’s less intuitive, the piano marking can also be perceived as the downbeat, with the forte sounding like a strong anticipation.

Both things occur simultaneously, much like the common image of the wineglass and/or two faces.

That gives us two half-speed tempos, along with the original  tempo. Three in one!

The ambiguity here creates a really interesting kind of tension as we flip between three different experiences.

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Hermit Crab and tension quality

Hermit Crab is the band that I’m writing for and playing in. It’s there that I’m working on addressing issues of rhythm and meter. Here’s a snippet of something that I’ve written for the band: 

You can see the relationship between what the drums are doing, and what the two guitars are doing. The drums highlight the rhythm of guitar 1 with a rimshot on the snare, and a floor tom highlights the rhythm of guitar 2. 

Notation, in this example, communicates a certain quality of tension. Imagine in your minds ear, the absence of quarter note triplets in the drums. Or the absence of the same in guitar 2. Rhythmic agreement between instruments disappears, and rhythmic tension changes.

But how?

Tension quality

It changes in terms of quality. Presence and/or absence of identical rhythms in different instruments changes the timbral signature of the that rhythm. Any rhythm can be given a timbral signature, and the mutation of that signature by the addition or removal of instruments changes the quality of the tension produced by that rhythm.

Dynamics are also effective in altering tension quality. Rhythms that create different tempos – the guitars in this example – can be given a different tension profile using varying dynamics.

Dynamics are also effective in altering tension quality. Rhythms that create different tempos – the guitars in this example – can be given a different tension profile using varying dynamics. The following example uses fairly extreme contrast in order to make the point. It can be a lot more subtle. It can also be a lot more complex.

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