http://www.we-make-money-not-art.com/archives/2010/02/acoustic-botany.php

Acoustic botany seeks to come up with ideas for creating plants that perform music. Taking from the idea that in the future many organisms will be genetically engineered to suit our needs, they are inspired by existing plants to design music-playing plants to genetically engineer in the future. Some of their plants would create music through symbiotic interaction with bugs and bacteria that reside within their resonating membranes. Their ideal result would be a “genetically engineered sound garden.”

I think this idea is cool and the idea of plants that emulate loudspeakers is something to look forward to. Unfortunately, they are currently only in the design phase of the project.