It’s called compression. They’re basically holding back air which gives benefits to singing, especially to baritones like Grohl. This is how guys like him and (Chris Cornell is a fantastic example) are able to sing much higher notes but with a full, chesty tone.
You can do this yourself by bearing down (basically push out your abdominal muscles like you’re trying to poop) and imitating the sound and feel of picking up something heavy. If you can manage to do this while controlling the pitch and sound with your vocal cords, then voila —you’re singing with compression. (If this feels unnatural then welcome to singing for literally everyone without kids of natural talent)
Not only does this provide the ‘gritty’ sound that you hear, but it also enables lower registered males to sing higher notes without using a falsetto (for falsetto think Mickey Mouse voice).
Another analogy would he letting air out of a balloon. If you just let it out freely the pitch will be a low pbtbtbtbtbt. But if you pinch the opening and hold back air, only letting a small amount out, you effectively raise the pitch and change the tone. Still the same balloon but a totally different sound, just based on how freely the air can escape.
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