Just because they don't hear music like humans doesn't mean there aren't effects.
You seem intent on "hearing" and "emotion".
You are not a plant.
A narrow view isn't conducive to seeing things you previously missed.
I couldn't care less about emotion (as plants have none), I was simply responding to the comment elbarracho made.
As for hearing, of course I'm intent on it, it is the bases of this discussion. The fact is plants can't hear, I am not saying they cannot react to vibrating stimuli, perhaps their is a process similar to that of a fishes lateral line at work; though, in this case, their is certainly no organ or specialized structure responsible.
If you could provide some scientific research suggesting plants are capable of responding to sound with information as to how, I might be more willing to 'widen' my view.A narrow view isn't conducive to seeing things you previously missed.
This is a fairly interesting NatGeo Documentary about plants and their sensory abilities:
http://www.megavideo.com/?d=ULJHVD76
At ~38:45 and it goes over sound.