a misheard lyric is called a "mondegreen". (http://www.physics.ohio-state.edu/~wilkins/writing/Resources/essays/mondegreens.html)
The term "mondegreen" was coined by Sylvia Wright in a 1954 Atlantic article. As a child, young Sylvia had listened to a folk song that included the lines "They had slain the Earl of Moray/And Lady Mondegreen." As is customary with misheard lyrics, she didn't realize her mistake for years. The song was not about the tragic fate of Lady Mondegreen, but rather, the continuing plight of the good earl: "They had slain the Earl of Moray/And laid him on the green."
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The term "mondegreen" was coined by Sylvia Wright in a 1954 Atlantic article. As a child, young Sylvia had listened to a folk song that included the lines "They had slain the Earl of Moray/And Lady Mondegreen." As is customary with misheard lyrics, she didn't realize her mistake for years. The song was not about the tragic fate of Lady Mondegreen, but rather, the continuing plight of the good earl: "They had slain the Earl of Moray/And laid him on the green."