How would an FM radio broadcast sound with songs mixed according to the musical key they are written

Mixing from one song to another not according to beats per minute (BPM) but according to the key the songs are written on.  In fact it may be considered BPM at hundreds or thousands of beats per minute. The bass note usually at the end of a song written in Gminor for example is G. A low G is less than 50Hz ie vibrates at less than 50 times per second. This is around 300 BPM! The next song may again be a Gminor or major song usually starting with bass G as well.


Of course one could modulate to different keys. And thereby using the songs themselves to play music in a generalized concept 1 hour broadcast for example.


An exaggerated example of mixing with musical keys or scales is Pleiadesradio channel on YouTube.