"Contagion A" is the sixteenth track (side 6, track 3 on vinyl) on the extended version of Bird Box Original Score.
- Bird Box Original Score
This is the only known version. The track has a foundation of rumbling percussive sounds somewhat reminiscent of heartbeats and punctuated on every fifth beat by a larger, louder beat. Mid-range percussive synth notes enter as the foundational beats gradually disappear, the beats then start to come back in with a different, more staccato pattern.