Truly the stars were in the proper alignment for this band. The combination of Robert Plant's amazing voice, Jimmy Page's stellar guitar riffs, John Paul Jones rock-solid bass, and John "Bonzo" Bonham's thunderous pounding on the drums.
They created metal, and gave us the most impressive albums of all time. With the possible exception of cuts from CODA, every Zeppelin song is good, and a whole lot are great. Some like Black Dog, and Stairway to Heaven are perfect, simply perfect in every way.
Led Zeppelin is the greatest band in the history of the universe.