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According to the Official Charts Company, "Alejandro" has sold a total of 436,000 copies as of February 2014, and was certified gold by the British Phonographic Industry (BPI).
Co-written and produced by herself and RedOne, the song inspired by her "Fear of Men Monster", the lyrics portray Gaga bidding farewell to her lovers.
Contemporary critics predominantly gave "Alejandro" positive reviews and noted that it takes influence from the pop acts ABBA, Ace of Base and Madonna.
"Alejandro" became Gaga's seventh successive single to reach the top-ten of the US Billboard Hot 100.
The accompanying music video was directed by fashion photographer Steven Klein and inspired by Gaga's love for her gay friends and admiration of gay love.
Critics complimented its idea and dark nature while the Catholic League criticized Gaga for alleged blasphemy, despite Klein dismissing the idea and claiming that the scene in question (the swallowing of Rosary beads) was Gaga's "desire to take in the Holy".