some songs i put in playlist have sound but 1 doesnt, WHY?

Answer 1

"some" copyrights, will not write.
try writing offline, (upgrade to media player 11), if you havent already.
good luck

Answer 2

When you click to play your playlist, the program (media player,etc..) needs to know the correct path to get to the song to play it. Say if you use Windows Media Player, it saves songs in the 'My Music' folder and that's where it looks when you click on a song/playlist. However, say you've got a song on your playlist that you downloaded from Yahoo or Limewire. That song will be located in the default folder for these programs. So, when Media Player searches the 'my music' folder it won't find the song and therefore can't play it because it doesn't know the correct path. The easiest way around this is to check all your music folders and copy them into your 'my music' folder. Then set the 'my music' folder as the default search folder for whatever media player you use. Now, with all your music in the same folder, your player can play them all. good luck :-)