Hearing music is not a common experience during in meditation but it happens occasionally. In some cases there may be a neurological explanation but it can also be due to psychic perception.
Meditation tends to increase one's psychic receptiveness. It calms the mind allowing one to become aware of faint mental impressions. Certain forms of meditation, particularly those involving visualization, calm the left hemisphere and stimulate the right hemisphere. The left hemisphere tends to be analytical and verbal. The right hemisphere tends to be visual and intuitive. It is believed that psychic perception is a right hemisphere function. Left hemisphere analytic thinking tends to interfere with psychic perceptions by coloring any psychic impressions that might be perceived with inferences, associations, and deductions.
If you become deeply relaxed while meditating and you hear music, it might be a consequence of being in the hypnogogic state. This is the state of deep relaxation that occurs just before falling asleep. It is common to hear sounds and see vivid imagery when in the hypnogogic state. Some of these perceptions are psychic but not all. If you spend a lot of time in that state by doing relaxation exercises, you can learn to tell the difference between psychic and normal mental perceptions.
I've heard music during meditation a few times. Once was during a class in mediumship. The air conditioner was blowing and making white noise during the meditation session. Then, the white noise somehow changed into music. I was the only one who heard it. When I described the music I heard (acoustic guitar), the physical description of the spirit I saw, and the manner of death I felt, one of my classmates recognized the spirit as a deceased cousin who had been a musician and had played that type of music.
Overlaying voices on top of white noise or other frequencies is a common technique used by spirits to communicate with the physical realm. In electronic voice phenomena (EVP), spirits add their voices to tape recordings of white noise. There was a medium who produced direct voice phenomena but had to have music playing to do it. The spirits somehow modulated the sound waves in the music to create voices. There is a book "The Ghost of 29 Megacycles" that describes devices spirits helped to design that broadcast ultrasonic audio frequencies over shortwave radio and somehow between the transmitter and receiver added their own voices in the normal audio range. This allowed people and spirits to have a normal interactive conversation. It required a medium (the human inventor) but the spirit and human team were trying to make a device to allow any spirit to communicate to communicate with any human.
Sometimes I wake up from sleep with a popular song going through my head and the lyrics are meaningful for some situation going on in my life. I tend to attribute this as a means by which spirit guides communicate with me because in some cases it seems precognitive. But I suppose it could be due to "Uncle Psimon" (Unconscious Psi).
There was a period of several weeks where every few days I would wake up with a very spiritual song going through my head. I don't usually buy CDs and I hadn't bought one in years, but something made me get CDs with those songs on them. Then, the Spiritualist church I had been going to suffered a schism and I and a few others started a new church. We didn't have anyone who could play the keyboard so we used my CDs with those spiritual songs instead of hymns.
Sometimes hearing music during meditation can be a perception of music that comes from the spirit world. This music can also be accompanied by colors. A number of books written by spirits through mediums say that in the spirit world, colors are associated with music. It's hard to know how reliable this information is, but they describe concerts where music is performed where color is an effect of the music and is considered by the composer when writing the music. In another case, a babbling brook is described as musical and colorful. If you are interested, there are a lot of books about life in the spirit world at Spritiwritings.com.
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