A steel string guitar with soundboard left a whole year in a beehive. Cedar, Bubinga, nomex, honeycombs, rosewood, mahogany, bee's wax finish, and propolis.
The Pawtuxet's soundboard was left a whole year in a beehive. Honeycombs are natural sound diffusers, bees use them to communicate via vibrations through them in a range similar to the guitar sounds.
Photo credits: John Deputy