This website seemed to back up my previous post.. plus it says there is a device you can attach to your plant and see if it likes the music


...now a Japanese company has created a gadget that puts you in touch with the 'feelings' of plants.

This gadget gauges the electrical activity in plants and can register a plant's response when exposed to music. The device is called the Plantone and has two sensor clips that are attached to the leaves of the plant.

..When the device's lamp turns red, it means a strong electrical current has passed within the plant's cells. It signifies a positive response. A green light on the other hand occurs when the cell electrical signals are weak, signifying a negative or unhappy response.
http://secretlifeofplants.tribe.net/...4-839d2f914227