> I wonder if this would be a good format for streaming, like the old days but global, with a live DJ and fans interacting live.

This is exactly why I've been working on a live streaming site for DJs and music lovers [1] where DJs can play whatever we like LIVE while also interacting with our listeners via a well-working chat (not those pesky shoutboxes most of radio stations seem to use). This differs from Twitch and other platforms being only focused on music and having lots of features for the DJs to engage and grow their fanbase.

I'm obviously biased but live streaming DJ sets and radio shows to a live international audience is very exciting and getting to listen proper oldskool DJs play awesome sets live feels always special. Internet FTW! :)

[1]: Slipmat.io - https://slipmat.io/