What exactly triggers the music change?

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The music in the game recently changed from the kind of bubbly, happy music that it starts out as, to kind of ominous, glitchy sounding music. It sounds like a negative of an image looks.
I tried to think back to what I did before I noticed the new music, and all I can remember is I think I had a Hacker attempt a boost, and they did an awful job (I got like 5 points or something). It seemed to have triggered right after that, but that seems to be an odd thing to be a trigger.
Can anyone verify what causes the music to change?
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What causes music to change?
As musicians grow older, they often become out of touch with the younger generation, the new styles could relate more to what the mind of the present was/were (musical styles are changing as we speak) thus causing the music to move in a more progressive manner.How does music change moods?
All of this is, of course, backed by research that shows that music can affect our emotions in different ways. Happy, upbeat music causes our brains to produce chemicals like dopamine and serotonin, which evokes feelings of joy, whereas calming music relaxes the mind and the body.What does music trigger in the brain?
One of the first things that happens when music enters our brains is the triggering of pleasure centers that release dopamine, a neurotransmitter that makes you feel happy. This response is so quick, the brain can even anticipate the most pleasurable peaks in familiar music and prime itself with an early dopamine rush.What music activates?
Of course, music activates the auditory cortex in the temporal lobes close to your ears, but that's just the beginning. The parts of the brain involved in emotion are not only activated during emotional music, they are also synchronized. Music also activates a variety of memory regions.How Does Music Affect Your Brain? | Tech Effects | WIRED
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Enoch Patro, Budgeron Bach, Jean Pierre, Tima Miroshnichenko