Yes, it's a good question. You do have people who like to sing alone while in the shower too, like me sometimes.
But maybe also part of why you don't often hear people cranking out a song while alone might be because singing is, in a lot of ways, a form of art, a form of musical art meant mainly to be performed for others to appreciate. So it basically becomes a social thing at that stage, possibly(?)
Just a thought.
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