Task: Question Answering
Input (English): Passage: Minogue has been inspired by and compared to Madonna throughout her career. Her producer, Pete Waterman, recalled Minogue during the early years of her success with the observation: "She was setting her sights on becoming the new Prince or Madonna ... What I found amazing was that she was outselling Madonna four to one, but still wanted to be her." Minogue received negative comments that her Rhythm of Love tour in 1991 was too similar visually to Madonna's Blond Ambition World Tour, for which critics labelled her a Madonna wannabe. Rufus Wainwright wrote for the Observer Music Monthly, "Madonna subverts everything for her own gain. I went to see her London show and it was all so dour and humourless. She surpasses even Joan Crawford in terms of megalomania. Which in itself makes her a kind of dark, gay icon ... I love Kylie, she's the anti-Madonna. Self-knowledge is a truly beautiful thing and Kylie knows herself inside out. She is what she is and there is no attempt to make quasi-intellectual statements to substantiate it. She is the gay shorthand for joy." Kathy McCabe for The Telegraph noted that Minogue and Madonna follow similar styles in music and fashion, but concluded, "Where they truly diverge on the pop-culture scale is in shock value. Minogue's clips might draw a gasp from some but Madonna's ignite religious and political debate unlike any other artist on the planet ... Simply, Madonna is the dark force; Kylie is the light force." Rolling Stone commented that, with the exception of the US, Minogue is regarded throughout the world as "an icon to rival Madonna", saying, "Like Madonna, Minogue was not a virtuosic singer but a canny trend spotter." Minogue has said of Madonna, "Her huge influence on the world, in pop and fashion, meant that I wasn't immune to the trends she created. I admire Madonna greatly but in the beginning she made it difficult for artists like me, she had done everything there was to be done", and "Madonna's the Queen of Pop, I'm the princess. I'm quite happy with that."In January 2007, Madame Tussauds in London unveiled its fourth waxwork of Minogue; only Queen Elizabeth II has had more models created. During the same week a bronze cast of her hands was added to Wembley Arena's "Square of Fame". On 23 November 2007, a bronze statue of Minogue was unveiled at Melbourne Docklands for permanent display. 
Question: What is the last name of the singer that had their London concert described as dour and humourless?
Output (English): Minogue.