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How Barca and Messi were rocked by Liverpool's heavy metal football

(CNN)Liverpool's stunning comeback against Barcelona in the Champions League semifinals has been described as the greatest in European history. But how did the English Premier League side overcome a 3-0 deficit to win 4-3 on aggregate and stun the La Liga champions? CNN Sport looks at five key reasons why the match turned in Liverpool's favor. READ: Liverpool stuns Barcelona to reach Champions League finalAn atmosphere like no otherAnfield under the floodlights tends to inspire. There is always hope on European nights when Liverpool plays in the iconic stadium, nestled among back-to-back terraced houses.The city of Liverpool and the Anfield district has had its fair share of economic and social problems and the football club is seen as key ...