"The first thing I noticed about the recording was the rhythm of the traffic light noise so I tempo matched that to 150bpm and began experimenting with different arpeggios to find a melody and a direction, I had the name Oslo Oscillation pretty early on so looked to incorporate some oscillating themes into the piece, the traffic light noise itself is oscillating in pitch, I put low pass filter on it at about 2500hz to take out all the high end, I didnt want to bury the noise but also didn't want it poking through too much. 

"The intro is a key point, I isolated the siren from the recording and then ran it through a guitar amp, it's a little bold sounding and is designed to attract attention and then the piece can begin.

"Tried to incorporate some interesting rhythms towards the end leading to a crescendo where it sort of falls apart on purpose."

Pedestrian crossing in Oslo reimagined by Gary Pitt.