First try another song. If that doesn't work, then try different headphones and make sure they are properly connected. If this fails, return to Apple if warranty is valid.
First step is to make sure that your headphones are connected into the headphone jack of your iPod. Next turn on iPod and turn up volume for maximum quality sound.
reset your ipod. ipod with click wheel-hold down (same time) menu button & select button (button in middle of click wheel) ipod touch-to hold down power button & home button
This is probably a problem with your earphones. Try replacing the earphones with new ones and see if that works. If there is still no sound, look carefully at the port where you insert the earphones to make sure that it is clean and they fit tightly.