Led Zeppelin is the best Roke Band ever...

In 2005 a radio station called Planet Rock held a referendum for 3500 listeners to vote for the best musician on each instrument to theoretically form "THE BEST ROCK BAND" in history.
The fruit of that referendum was the formation of Led Zeppelin as it is.

Source: http://www.waaf.com/blogs/led-zeppelin-gets-voted-ideal-supergroup-poll