Here is a waterfall I made of 580, showing the carriers of the various stations I can receive. It started before sunrise, maybe around 1015z, at the bottom, time goes up. I just stopped it a few minutes ago, around 2240z. The big fat carrier is WHP. I think I can count at least 15 of them. There are supposedly 25 active stations in the US/Canada on 580, so right there I see 60% of them. Maybe one is CKWW?

It's fun looking at MW station carriers, some are lines, some have squiggles in them (maybe from fans or AC units turning on and off?), some have a large drift, probably when they switch power levels. Each is really a fingerprint.
