One's a pub classic, belted out at top volume by tipsy patrons around closing time. The other is a more dignified affair, a favorite of youth choirs and choral groups.

Now, as unlikely as it seems, the classic children's song, "Kookaburra," and the Men At Work hit, "Down Under," are set to go head-to-head in court amid accusations part of the rock anthem is a rip-off, the Daily Telegraph reports.

Music publishing company Larrikin owns the "Kookaburra" song and claims the melody that accompanies the line "Kookaburra sits in the old gum tree" is reproduced in "Down Under." The case is due to start in full within days.

A fresh battle erupted yesterday, with lawyers for "Down Under" songwriters, Colin Hay and Ron Strykert, and music giants, Sony BMG Music Entertainment, Sony DADC Australia, EMI Songs Australia and EMI Music Publishing, claiming Larrikin doesn't actually have copyright to "Kookaburra" - the Girl Guides, an Australian scouting group, do.

The part of the "Down Under" song that is alleged to have breached copyright is the distinctive flute riff.

According to court documents, lawyers for the songwriters and the record companies will argue "the Down Under work does not incorporate the whole or any substantial part of the "Kookaburra work."

Click here to read more and watch the song comparison video from the Daily Telegraph.