What exactly was the “wall of sound” technique and why was it so important for music?

Question

I read the wikipedia page on it and im still confused on how it is made and what exactly was so good about it. Im not familiar with music production but ive seen people mention Spector and how he contributed to music and the “wall of sound” is always something i see people mention. But i never know what exactly that is

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Answer 1

I guess a good example would be of Michael Jackson’s thriller. He sang “cause this is thriller, thriller night” on one track in a certain key. Then he sang the same thing on another track in another key. He repeated this process around 8 times to make a chord, like playing more than one note at the same time on a piano or guitar. The final result was a layered sound which gave depth to the vocals that you couldn’t get with only one track.