Did you just think of a grand piano or Stradivarius violin? Well, fabulously valuable musical instruments are common heirloom candidates, but so are other, less impressive musical items. How about the lowly harmonica or tambourine? Think of the craftsmanship used in making balalaikas, wooden drums or even wind chimes. Sound evokes strong sense memories, and it isn't so surprising that musical instruments -- even those with little monetary value -- would be popular heirloom keepsakes.