A dive into the interesting world of Vocaloid, video has timestamps so if you want an overview on what it is you can start there and watch around 7-8 minutes of it.

If you want suggestions on musicians using vocaloids to check out you can start with this link and watch about 10 minutes.

The rest of the video is digging into some of how vocaloids work and how the software is used in making music. It's interesting stuff, I thought!