https://www.mentalfloss.com/article/59902/101-masterpieces-john-cages-433#:~:text=After%20another%20minute%20and%2040,%2C%20stood%20up%2C%20and%20bowed.&text=The%20piece%20was%20called%204,It%20seemed%20like%20a%20joke.

Excellent article.