In the documentary These Hopeful Machines, it is used as the background for an article on callsigns, which suggests that it may originally have been one of the undiscovered ones.
Here is a reverse-engineered score for Fresh Aire created by studying its spectrogram, available in three formats:
- The input file for the Lilypond music typesetting program
- The typeset output as a PDF (on the right)
- Lilypond's output as a MIDI file that you can listen to
- See ESL104.