A while ago there was a Probability Zero in Analog entitled "The Ears Have It." In it various civilizations gave up on searching for intelligent life...because they were all listening.
Hence METI - Messaging Extra-Terrestrial International - SETI's cousin. And they just sent their first targeted message.
The target is a super earth 12 light years away. The content? Mathematical data and...music. (It's very likely music is a universal).
If anyone's there, we could get a response as early as 2042...
If anyone's there and they're advanced enough to hear it and respond, that is.
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