The video below showcases several music implementation systems I've worked on - mostly in Unreal Engine and FMOD. The games showcased in the video don't match the style of Contingent, but the systems are worth looking at! In the interest of time, I've restricted myself to only a couple of examples, but there's plenty more I'd love to talk about, such as end-of-combat stingers, gameplay synced to music, or musical building blocks that generate ever-changing harmonies!