Ah, "Stairway to Heaven." The prime jewel in the classic rock crown. For decades, it's topped radio station polls as the greatest song of all time. Regardless of that subjective honor, it has been played on the radio millions of times in the decades since it made it's debut on Zeppelin IV in 1971.

Jimmy Page loves the song; he performed an instrumental version of it on his solo tour in the '80s, and may well bring it back again if he indeed tours next year. Robert Plant, on the other hand, isn't such a fan of the song, having only performed it on rare occasions since Zep's demise, and even paid a radio station to not play the song.

But in this interview, Plant fondly looks back on writing "Stairway" with Page. "The thing is, if you're that involved with another character, another human being, as Jimmy and I had been in writing�sometimes the same mood can flow through you at immediately the same time," Plant explains. "When that happens, that is the peak point for creation."

One night while the rest of the entourage were otherwise engaged, Plant recalls, he and Page were sitting around a bonfire. A lengthy conversation led to the creation of one of rock's most iconic songs.

Plant kicks off a U.K. tour next month. Don't look for "Stairway" to make his set lists, but he does play a lot of other Zeppelin songs. And here's hoping Jimmy Page tours the U.S. in 2015.