Elton John's "Candle in the Wind" reached No. 1 on the Billboard pop chart 20 years ago.
The original version of the song, which came out in the 1970s, was about Marilyn Monroe. Bernie Taupin rewrote the lyrics as a tribute to Princess Diana shortly after her death.
Elton John has only performed the song live once, during Diana's funeral at Westminister Abbey. It's the second best-selling single of all time, topped only by Bing Crosby's "White Christmas." Profits from the sales of the single went to Diana's favorite charities.