The mythbusters showed plants responded to music better than no music, with death metal the best, then classical, then just speech or recordings of talking, it didn’t matter if the talking was positive or negative. The conclusion was plausible, and the hypothesis was the vibrations stimulate the plants to grow, which would explain heavy metal doing best. I think the main benefit of talking to plants is the CO2 we breath out while talking, but that was taken out of the mythbusters experiment intentionally since the CO2 is already proven fact. Oh, and I do have a stereo in my grow room, it’s just a blue tooth receiver/amp with Bose cube speakers and woofer. My plants listen to music whenever I’m in the room. I can’t prove it makes a difference one way or the other, but it doesn’t hurt.