Forgive me if this was braught up in earlier posts for this subject (I just skimmed the previous posts). This has been studied over and over for the subject of plants and their responses to various audio stimuli. There was also a great deal of study done by a Japanese guy (I think it was japanese...I beileve he's known as the "Water Doctor") on the same subject but with water...turns out water is very much alive.
Turns out Classical music is the best for plants. Anything "soothing and nice" works wonders. If you play heavy metal or scream nasty things ta the plants, they wilt.