TPC also provides lots of databases, queries and benchmarks for all different types of applications of databases:

http://www.tpc.org/default.asp

Delivered as Windows batch files. Which is fine, but the title doesn't hint at that.

I mean sure, but it all boils down to invoking some SQL commands if you want to drop it in bash or powershell or w/e

https://github.com/lerocha/chinook-database/blob/master/Chin...

It is in the project root directory: https://github.com/lerocha/chinook-database/blob/master/LICE...

It appears to be the MIT license, though I didn't do a full diff to make sure: https://opensource.org/licenses/MIT

It's called License.MD and when this file exists, Github automatically links to it on the right-side of the menu above the file explorer as "View License". Sometimes the button will even say the actual license type if it can be automatically recognized.

License.MD.