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He means that a lot of alt coins are going to rise steeply in price or "pop" like a popcorn kernel. The sound of popcorn popping is like music and in the this reference, @haejin likens the sound to classical music. I prefer to liken it to the sound of Heavy Metal or Punk Rock!!! FAST AND FURIOUS!!!

Thanks for the elucidation 👍 I'm kind of new in the game. So I'm still trying to know my way around it 😃

LOL! You got it!