ukelele

So my two cousins came over for dinner the other day and they brought their ukelele's with them.  Of course they aren't too good because they are only ages 5 and 7, and have only been taking lessons for the last month or so.  But when I tried out their ukelele I noticed that the strings had to vibrate in order to make the sounds, much like all stringed instruments must.  So thats when I realized that the strings move in an up and down motion with a minute amplitude that decreases over time.  Although this isn't simple harmonic motion, it is still a real life example that appeared in the most recent week of my life.  Physics, once again, appears to be everywhere!