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Tubular Bells and "Golf Bravo Romeo" - the accidental recording of a VLF transmission.
I might have posted this before, but being both a musician and a radio amateur, I just like this story:
Between 1972 / 73 Mike Oldfield recorded Tubular Bells at the famous studio "The Manor".
Located 60 Km from The Manor was Rugby Radio station, a Longwave and Very Long Wave (VLF) transmitter of the UK government, that was mainly used for transmitting time signals and for submarine communication.
During the recording of Tubular Bells a test transmission from the 16 KHz VLF transmitter (Callsign GBR) was accidentally picked up by the recording equipment and made it into the master.
This transmission can be made visible with openly available tools like the Audacity audio editor. If you have TubularBells, then you can load it into Audacity, enable spectrogram view and you will see something like below (the first 10 seconds of Tubular Bells). "vvv GBR" is clearly visible in morse code around 16KHz.
BTW: It is best to use a WAV file recorded from CD. MP3 is removing most of the signal.
Just to add: It is very common to start a transmission with a series of "Victors" (the letter V) in morse code. This is just to alert receivers and radio operators that a transmission is imminent. Another piece of music that features these intros is "Lucifer" by Alan Parsons Project: v v v v EVE.... - and it is the base of the pieces rhythm.
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I have created a Drambo project that emulates a dual heterodyne VLF receiver. Load your TubularBells into the FlexiSampler and hear the morse code. MP3 files don’t work well. It’s best to use a WAV file directly from CD. The VLFReceiver module can be used for listening to live transmissions (e.g. SAQ) as well:
https://patchstorage.com/vlf-receiver-a-drambo-for-radio-amateurs-project/