Why There’s More Music on AM Now?

I've notice that too, there seems to be more AM stations with tunage, again. Radio Survivor has noticed that too, [www.radiosurvivor.com]

That, and Boomer found an updated AM Stereo Map on facebook, [www.facebook.com]
Neat radio dump site, but I didn't see the map. Maybe, y'all can play 'Where's Waldo' and try to spot that?