By the new researches it was proven the effect of the energy (no matter what shape the energy takes: a word, a prayer, a thought, music, healing, any kind of sound, etc.); you can watch on the link below how the water crystals are modifying their structure... and by conclusion, as our bodies are made of water of over 60%, one can imagine what an effect can have over us the negative(perverse) or positive (benefic) energies!
http://www.youtube.com/v/lkbpXRSIUnE&rel=1Namaste!