Song on AM radio sounds as if it should be easy.  I remember playing tunes on paper tape readers, and that actually was easy provided one had a fast enough optical reader.

I learnt to play the paper tape reader when it was new stuff, about 50years ago.  I would be very surprised if I could get a CTL Modula One computer with a 2000 cps optical paper tape reader to play a tune now - without a lot of head-scratching and trying to remember stuff I've now forgotten, 

Not knowledge at all, is probably a fair description.  But learning it sure was fun.