Because you are probably using the LW player. Either download the latest LW beta that has an improved player, or just use your regular player for song playback. To do the latest, you need to find where your downloads are saved, so open Lw, Tools, Options, saving. That's where they are.

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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-