S1: Harsten’s theory was that plants definitely react to music. P: In his experiment, he used two banana plants. Q: The music was in fact a high-pitched humming sound. R: He gave both plants the same light, heat and water. S: But for about an hour a day, one of the plants ‘listened’ to some music. S6: He found that this plant grew faster and 70 percent taller than the other plant. Find the correct sequence of P, Q, R and S.