The original key of the song "Fernando" by ABBA is D minor. It was released in 1976 and became one of the band's biggest hits. Written by Benny Andersson and Björn Ulvaeus, the song was initially recorded in Swedish and then translated into English. "Fernando" is interpreted as a tribute to the soldiers fighting in the Spanish Civil War. A curious fact about the song is that it was originally intended to be a solo effort by ABBA member Agnetha Fältskog, but the decision was made to include it as a duet. The melody of "Fernando" is catchy and memorable, with a mix of dramatic and uplifting elements throughout the song.