Obscure question bugging me badly

[Chris]

Yo,

There is a bass rifflet that is bugging me.  Where the hell does it come
from originally?

If you got the Night Of the Hawks DVD then when you start the dvd there
is a bass rifflet playing during the menu, I always assumed it was
Hawkwinds.  Now I think it cant be because the same rifflet is played
for about two bars on "Dazed And Confused Concludes" from Led Zepplin's
film Song Remains The Same.  Now near that Jimmy plays a bit of Hendrix
(purple Haze from memory for a few bars) so I'm thinking Jimmy is
throwing in something from someone else.

Who is the someone else?  Where does this come from?

Chris