Yup, must be one of those "bundled" .mp3 files that come with all sorts of ads...
Just restart LW, hoping that the evil file will be kind enough to leave the player.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-