Yeah, there is: you know where your songs are on your PC? Good. Now all you have to do is find where the Shared folder for Limewire is located and put them there. To find it, go to Limewire, Tools, Options, Saving and note down the location that is indicated there. Open an explorer window and go there then drag and drop the songs into that folder.

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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-