On the back of this thread, I've been listening to a playlist called "100 Best Covers of all Time" on Spotify. My gawd, there are some awful versions on it ... (Because the Night - Bruce Springsteen, and Perfect Day - Duran Duran stand out in this respect).
But a few gems also ( Pround Mary...
In which case I'd suggest (and, only suggest) that it was a hole made by a greenkeeper in the care of the course. (Although for what reason I can't guess). So, it seems to me you were likely to get free drop as it would be ground under repair (and not need to be marked)
Perhaps the OP can provide more detail?
But given he stressed the word 'exactly', I suppose he was indicating it was small, round & neat - ie like a hole on the green. In which case, I think one can easily assume it was still not made by an animal.
Short answer is ... it depends.
If it was a hole made by the greenkeepers whilst they were looking after the course, then it counts as ground under repair and you get free relief under 16.1. But if it wasnt made under those circumstances, then you'd have to declare it unplayable and take relief...
Someone earlier mentioned Harry Nilsson's 'Without you'. Best ever cover version I heard of that was by an Oompah band who were wandering around the streets of Lucerne.
Really, really, cant pick a favourite but a few notable mentions are
Rodrigo & Gabriela - Orion (or indeed, Stairway to Heaven off the same album)
Talking Heads - Take me to the River
The Slits - I heard it through the Grapevine
The Stranglers - Walk on By