We make sound waves too! Your throat has it's own musical instrument that we call singing.  Inside the throat are vocal chords that vibrate and make sound waves - just like we've been learning about.   If  you hold your hand over your neck you can feel the vibrations when you make a sound.  When you make a high pitch sound it feels different than when you make a low pitch sound.  Each sound has it's own wave shape - you are sending  out invisible sound waves every time you make a sound.  Singing is a special way we use our vocal chords.    Here is a fun link to play with some different pitches of sound waves. Thanks to:  Swedish television company SVT hosts a fun Flash application with four crazy, silly singing horses. To hear the horses sing acapella, just click on the horses’ heads one by one. A fun game for both kids and grown-ups!