More and more people are adding additional monitors to their computer set-up. The reason for the additional monitor is more desktop space to be able to do several things at once. If you don't have sound on the additional monitor, it could be from a simple setting that needs to be adjusted.
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Monitors are basically screens to display the video image from your computer. Some older computers had speakers built in to the side of the monitor, but almost no new monitors have this feature, as of 2010.
To hear sound you need to have speakers plugged into your sound card. If one monitor has speakers and they are plugged into the sound card, there is usually not room for a second speaker connection. Even if there was, you would not likely want four speakers playing sound.
If for some reason you have speakers plugged into your second monitor and they are connected to a sound card and you are not getting sound, there is likely a simple setting that needs to be changed. Make sure the speakers are on. Check the sound settings in Windows to make sure the correct sound card has been chosen and that the sound is turned up and not muted.