To officially launch our A Toronto Symphony collaboration, I created a series of chords last month to serve as a kind of “genetic” code for the project, and also to serve as material that we could share back-and-forth to modify and to make new things. Chord progressions are great because they are both simple – a kind of musical backbone or skeleton – yet complex enough to truly tell a story. Just think of the chords in a classic piece by The Beatles like “Michelle”, or the way Bach squeezes a universe of expression out of his seemingly simple 4-part Chorales.

What’s your signature Sound of Toronto? Business consultant and visual artist Derek Wong says one sound in particular is most memorable: the three-note melody that plays when the TTC subway doors close. “It actually drives me crazy,” he says. Watch: