The power of music to sooth emotional, mental or even physical pain are well documented. People listening to classical music, or meditation music, experience a calming effect.
Music acts on the body improving the respiratory, circulatory, digestive and vegetative systems. On the mind, it can create a calming state, or the contrary, create anxiety and even aggression.
Music therapy is successfully used to treat various mental conditions as well as it acts directly on the human psychic. But indirectly it also acts on the core body systems, and together they alleviate pain and anxiety for people having health issues or who must undergo surgery.
By overlapping classical music with solfeggio / rife frequencies, some listeners can get some special effects. You can find information about these frequencies on the internet