Here's a funny but interesting article. If you give plants complements, they'll grow faster. Joel Sternheimer states that plants responded positively to arranged notes which corresponded to the building blocks of proteins, the amino acids. Furthermore, farmers who tried to mimic the sound of birds and the natural forest habitat of their crops experienced higher crop yield. The full article can be found here:
http://www.findingfacts.com/content/view/19/2/