If I had to pick a top 5, I'd say:
One of These Days (Pink Floyd)
Jessica (Allmans)
Samba pa Ti (Santana)
Elizabeth Reed (Allmans)
Frankenstein (Edgar Winter Group)
It's hard to limit to just one, found several lists of the best rock instrumentals -- several of them DO have One of These Days and so many list Green Onions too (not one of my faves, but to each his own).
One of These Days (Pink Floyd)
Jessica (Allmans)
Samba pa Ti (Santana)
Elizabeth Reed (Allmans)
Frankenstein (Edgar Winter Group)
It's hard to limit to just one, found several lists of the best rock instrumentals -- several of them DO have One of These Days and so many list Green Onions too (not one of my faves, but to each his own).