@lobonz,
http://www.fun-with-words.com/mala_mondegreens.html
Mondegreens – Misheard Lyrics
Mondegreens are a sort of aural malapropism... mondegreen is generally used for misheard song lyrics, although technically it can apply to any speech. They are oronyms (homophones) ...
originally coined by author Sylvia Wright, and has come to be quite widely used. As a child, Wright heard the lyrics of The Bonny Earl of Murray (a Scottish ballad) as:
Ye highlands and ye lowlands
Oh where hae you been?
Thou hae slay the Earl of Murray
And Lady Mondegreen