Hardcore to ambient glissando

Some people here may be familiar with the Hurdy Gurdy Glissando by my fellow Cantuarian Steve Hillage. Now, i understand there are various subgenres of hardcore going by such names as speedcore, splittercore and terrorcore according to their tempo, though how real these are or what order they come in, i have no idea. There is also ambient new age hippy bollocks music which is eerily soothing.

I contend here that these are in fact potentially the same genre.

I demonstrate that this is the case thus. Imagine a five minute music track which starts off as hard core, i.e. around eight dozen beats per minute. For a few seconds, it stays at that tempo, just to lull the listener into a false sense of insecurity. Then it starts to edge up the tempo, transmuting thereby into a variety of different subgenres with respect to the beat, levelling out at about the two minute mark at a rate of five and a half gross BPM. It then stays at that mind-blowing rate for say twenty seconds. Then, over the next ten seconds, it steadily speeds up again until the beats become ambient "melody" without audible percussion. It then stays at ambient until almost the end of the track, then slows down through the different tempos back to hardcore.