Songtree. Tree. Small flowering trees with peanuts. Trunk is blue gray and has brittle leaves instead of pods are large and blue green. The branches naturally grow holes in the branches and trunk. Together with foliage and wind, each tree actually creates a complex song depending on the weather, time of day, and season. Trees can grow for hundreds of years and songs can change over time, but never strays too far from original melody, unless there is some significant event which affects it.