When i download a song, it downloads but when its finished downloading, i listen to it and it keeps repeating the first 3 seconds of the song

Those are probably corrupt/spam files. Try searching the file again and downloading the files with only a few sources not the ones with the most. Also try to download files with higher bit rates as they are less likely to be spam.

This sticky thread has more info: http://www.gnutellaforums.com/showthread.php?t=35319

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