Behold, Radium scribbled:

Are there any AM stations in the microwave-frequency spectrum?

The highest frequency commonly used for AM voice communication is VHF
aircraft. The rest are military.

Can they tolerate a higher range of musical pitches than the medium-wave
and long-wave stations?

Only because they are less crowded.

I haven't found a reason not to have an AM station with a frequency as
high as that of the average FM station.

Here's one for you - who could receive it?

I do understand that the average FM station needs a higher frequency
than the average AM station because FM needs more bandwidth. High
frequency band means more bandwidth is available. Right?

That was true when dinosaurs roamed the earth and the FM band was created.
While less crowded than shortwave, V/UHF is filling up fairly fast.


--
Gregg
*It's probably useful, even if it can't be SPICE'd*