...by Led Zeppelin has to be the song that I've been in love with for the longest period of time. And I can't think of another cover that sounded SO MUCH better than the original.
Here's some interesting trivia about the song from a Wikipedia page that explains why this song sounds so different from anything else.
"The famous drum performance was actually recorded by placing the drumkit and drummer at the bottom of a stairwell at Headley Grange, and recording it using a microphone three stories above, giving the distinctive resonant but slightly muffled sound. "
"Jimmy Page recorded the harmonica part using the backward echo technique, putting the echo ahead of the sound when mixing, creating a unique effect."