There has been past discussion of RaveDJ, but it has improved significantly since then.

In college, I would frequent the Mashups room on turntable.fm and use it as background music for studying, so I was pretty excited to see this.

I spent more time than I'd care to admit when I found it creating new mashups and also comparing/contrasting them to some of my favorite human created mashups.

Here's an example of one I actually enjoyed. (Note: Ads will autoplay prior to playback) https://rave.dj/G7AS9HjKvBK6Nw

If you'd like to compare and contrast with some mashups created by humans, I'd encourage you to check out The White Panda, Super Mash Bros, 5 & A Dime, 3LAU, and Kapslap. Fair warning, a lot of this material may only be available on YouTube or SoundCloud.

Finally, I know some of the people that created RaveDJ are on HN and if they happen to see this, a technical write-up of how RaveDJ works would be of great interest to me, and others I'm sure, if you have time.