I've heard a variety of sounds in hyperspace. The most common sounds I hear are sci-fi and/or computeristic. This ranges from automated sounding sequences of high frequency pitches to phaser/flanger sounds of motors. The strange part is that it sounds like it's coming directly in through my ears. I can practically feel the vibrations on my ear drums like physical sounds.
During my first white light encounter with the godhead, there were two distinct predominating sounds. The first was the sound of a rocket engine only like 50x smoother and louder and coming from every direction at once. It was just the most encompassing, embracing hum ever. So while you have this rocket sound going as I'm soaring through white light, there are these two golden puzzle piece entities flanking me like angelic satellites. They seemed to be the fully expressed forms of an entity/entities with whom I'm much more familiar. They were creating these computeristic automated sequence sounds, but this particular entity has a recognizable rhythm to its voice. The same peculiar rhythm it uses in telepathy, it also uses in sounds, and there are a number of these entities whom I can recognize solely by the kinds of rhythms they use to communicate.
I had always assumed that when people talked about hearing music in hyperspace, they must have just been over-glorifying the kinds of sounds I had been hearing. After all, what I had been hearing was "music to my ears" anyway. However, I had one experience in which I realized I was dead wrong. I had ripped the GVG with DMT and harmine, and I had the feeling like I was about to see the godhead. I wound up all the way in the veeeery back of my head (wherever that is), but all of a sudden all the machinery started breaking down and malfunctioning, and I could tell that I would probably get no further. So the next thing I know, I'm just serenely floating out in the cosmos as I look down at the colorful nebulae and galaxies below in the black void. As I turn my attention to these galactic wonders, I notice the most beautiful music being played. First of all, the "instrument" that was making this music sounded both like a real physical instrument while paradoxically sounding somewhat impossible. It was as if a harp were having its harmonics plucked on hollow, tinny strings. Perhaps the closest approximation of sound would be a music box. The crazier part was what this meta-instrument was actually playing. It was a children's lullaby. It was being played in perfect four-part harmony, except the notes were not western pitches. They were distinctly "off", yet they fit together harmonically like a glove, which I found particular fascinating/haunting. It felt like it was quite literally playing on my heart strings. I could feel my heart light up with each pluck. It was absolutely amazing, and I would so much like to hear it or other music like that again.
"Science without religion is lame. Religion without science is blind" - Albert Einstein
"The Mighty One appears, the horizon shines. Atum appears on the smell of his censing, the Sunshine- god has risen in the sky, the Mansion of the pyramidion is in joy and all its inmates are assembled, a voice calls out within the shrine, shouting reverberates around the Netherworld." - Egyptian Book of the Dead
"Man fears time, but time fears the Pyramids" - 9th century Arab proverb