1. Emergence. In his book ‘This Is Your Brain On Music’, Daniel Levitin describes a certain kind of devotional four-part male harmony that, if sung correctly, can give rise to an ‘emergent’ sonic phenomena that from the audience perspective sounds like a fifth, female voice. The guys who practise this type of thing like to call it the voice of Mary blessing the singing. We're not really that esoteric. But we are four dudes who sometimes sing together. And one of us has the habit of sounding like a girl.

2. Dischord. Remember having to sit through music class at school and the teacher telling you how proper chords are grounded in the I, III and V of a scale, and how certain other combinations of notes from the scale just sound jarring and wrong? We all skipped that bit.

3. Syncopation. Yeah. Possibly a bit math nerdy. But it's fun, and makes you dance strange. We're also pretty sure that Rosie's never played a beat without it.

4. Binaural Beats. It makes our head hurt trying to explain this. But it's well worth the Wiki time. 

5. Tinnitus. You've been warned.

Charge Group play Out The Back, part of Brisbane Festival, at Metro Arts, September 14.