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Of course, the title track from Unknow’s self-titled album
A number of bands—usually from the old-school metal genre—have these kinds of songs.
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Hahaha I can only think of Black Sabbath 
It means ‘No Source Selected’, ensure that you’ve selected the correct source (e.g., FM, AM, CD, USB, Bluetooth, AUX).
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No, it chose to overlook it. It kept telling itself to Unknow how awful your song was. What devil did you play?
I suspect it is Device or Connection Issue … If you’re using a connected device (like a phone via Bluetooth or USB), check if it’s properly connected and functioning.