Well, who knows.
These people could be the biggest Thin Lizzy fans in the world but wouldn't tune down just a half-step to E flat to play one of their songs correctly. They will often moan on about how it's not necessary to tune a guitar out of E but, when prompted for a reason why, they will just mutter, trail off and then be quiet again.
Drummer: Sure thing. But, uh, you'll have to tune your guitar to drop D, that's how Jimmy Page played it.
Standard Grandad: ...Forget it, I can't stand Led Zeppelin, bloody fiddling about with tunings *throws guitar in trash*