Nikon D600 Rating
Ah, the old Led Zeppelin classic. I remember Jerry Garcia sang the lead on that number. I saw the song performed live one time in a tiny basement bar in Hamburg, Germany, back in the early Sixties by some band out of Liverpool. This hilarious guy named Ringo played drums. And some guy American guy named John Fogarty played guitar. He sure was great! I remember that show well because I was drinking with this really looney, melancholy British chap named Roger. He claimed he'd written the song for his group, Pink something-or-other, but that some singer named Jagger stole it and then turned around and sold it to Led Zeppelin... IIRC.
I confess that period of my life is kind of a blur to me now...
This is Brain Damage from Pink Floyd DSOTM...Though there are enough hints in what you wrote above that tell me that you know that too perfectly well...