This guy's whole channel is really good https://www.youtube.com/@EdanMeyer/videos

It's less about the singularity and more about Machine Learning in General but unlike a lot of the sensationalized garbage you'll find on youtube, it's very educational.

If you're looking for something that's easier to digest Robert Miles is really good at breaking down AI allignment into funny entertaining videos https://www.youtube.com/@RobertMilesAI