It’s called audiating, where you can actually hear the music in your mind before you ever make a sound. When you go to hum or whistle, your brain already knows what’s correct because you’ve practiced it subconsciously, meaning you can easily adjust for mistakes as you go.
Musicians practice this constantly, as it’s an essential part of reading sheet music.
Your brain knows how the song is supposed to go, and it also already knows the mouth shapes it needs to make to produce any given note because you’ve already had plenty of practice whistling. It’s like playing the piano or something. Practice enough and you just know how to play it, so you can sight-read (play a piece of music based solely on the music infront of you without any practice) reasonably well.
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