" Now Mrs. Retallack wondered how the effects of what she called "intellectual mathematically sophisticated music of both East and West" would appeal to plants. As program director for the American Guild of Organists, she chose choral preludes from Johann Sebastian Bach's Orgelbuchlein and the classical strains of the sitar, a less-com­ plicated Hindustani version of the south Indian veena, played by Ravi Shankar, the Bengali Brahmin. The plants gave positive evidence of liking Bach, since they leaned an unprecedented thirty-five degrees toward the preludes.

But even this affirmation was far exceeded by their reaction to Shankar: in their straining to reach the source of the classical Indian music they bent more than halfway to the horizontal, at angles in excess of sixty degrees, the nearest one almost embracing the speaker. In order not to be swayed by her own special taste for the classical music of both hemispheres Mrs. Retallack, at the behest of hundreds of young people, followed Bach and Shankar with trials of folk and "country-western" music. Her plants seemed to produce no more reac­tion than those in the silent chamber. Perplexed, Mrs. Retallack could only ask: "Were the plants in complete harmony with this kind of earthy music or didn't they care one way or the other?" Jazz caused her a real surprise. When her plants heard recordings as varied as Duke Ellington's "Soul Call" and two discs by Louis Arm­ strong, 5 5 percent of the plants leaned fifteen to twenty degrees toward the speaker, and growth was more abundant than in the silent chamber. Mrs. Retallack also determined that these different musical styles markedly affected the evaporation rate of distilled water inside the chambers. From full beakers, fourteen to seventeen milliliters evapo­rated over a given time period in the silent chambers, twenty to twenty­ five milliliters vaporized under the influence of Bach, Shankar, and jazz; but, with rock, the disappearance was fifty-five to fifty-nine milliliters. "

― Peter Tompkins , The Secret Life of Plants: A Fascinating Account of the Physical, Emotional and Spiritual Relations Between Plants and Man