hungprocess
Aretha Franklin - Bridge Over Troubled Water (originally by Simon and Garfunkel)
Sly & The Family Stone - Que Sera, Sera (originally Doris Day)
The Isley Brothers - Love The One You're With (originally Steven Stills)
I like the Castlevania explanation for why crosses work on vampires:
"Vampires are basically an evolved predator species, so their eyesight is pretty different to ours. Turns out that if you put a big geometric shape right up close in their field of vision, it confuses the shit out of their brains and, you know, makes them panic."
I believe the term you're looking for is "stank face". I'll sometimes do this when I'm listening to a song and a part is especially virtuosic or surprising. When you see a musician doing it it's often either concentration or them hitting sort of a flow state where they're really feeling what they're playing.