Since I've been loving you is my favorite Led Zeppelin song or When the Levee Breaks.
"Since Ive been loving you" is truly a great song, also "when the levee Breaks" both awesome songs, timeless...
they do not have one bad song....every bad out there has a bad song that just don't do it...lots of bands only have a few good songs.....but Zeppelin....not a one
they are in my mind the greatest of all time.
for many years I would listen to nothing but Zeppelin, the first music other then Zepp I started listening to was Metallica back when I was about 20....love there early stuff, but man did they choke on the black Album and every one after that...

now I do get into a lot more different music...even like eminem
but my favorites besides Zepp would be
Flotsam and Jetsam
Megadeth
The Animals
Ten years after
Black Sabbath
Iron Maiden
Judas Priest
Blood red skies by Judas priest describes me perfectly
As the sun goes down, I move around
Keeping to the shadows
Life, hangs by a thread
And I've heard it said, that I'll not see tomorrow
If that's my destiny, it'll have to be
So I'll face the future
Running out of time
I'm on the line
But I'll go down fighting
Felt the hand of justice
Telling wrong from right
Threw me out upon the street in the middle of the night
Cybernetic heartbeat
Digital precise
Pneumatic fingers nearly had me in their vice
Not begging you
I'm telling you
You won't break me
You won't make me
You won't take me,
Under blood red skies
You won't break me
You won't take me
I'll fight you under
blood red skies
Through a shattered city, watched by laser eyes
Overhead the night squad glides
The decaying paradise
Automatic sniper
With computer sights
Scans the bleak horizon for its victim of the night
They're closing in
They'll never win
You won't break me
You won't take me
You won't make me,
Under blood red skies
You won't break me
You won't take me
I'll fight you under
blood red skies
As the end is drawing near
Standing proud, I won't give in to fear
As I die a legend will be born
I will stand, I will fight
You'll never take me alive
I'll stand my ground
I won't go down
You won't break me
You won't make me
You won't take me,
Under blood red skies
You won't break me
You won't take me
just I'll face you under
blood red skies
You'll never take me alive
I'm telling you
Hands of justice
I will stand, I will fight
Never surrender
As the sun goes down
I won't give in to fear