Why is it that I can sing along to a song I don’t know the lyrics to perfectly in my head?

Why is it that I can sing along to a song I don’t know the lyrics to perfectly in my head?
Like I don’t know the lyrics to a specific rap song or song or whatever and sing along to it perfectly in my head? not out loud but same as when you’re reading something and you speak in your mind.
Hum Tv Dramas Lyrics 2015
Submitted by mightbethewalrus

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