History on vibrato, Interview of Marcel Mule by Claude Delangle

I always enjoy visiting you, and I come almost every year, but today I will be taking notes, since my students asked me to. They said to me : “ You know Marcel Mule but we don't !”. My point here is to transmit a form of legacy. You have often told me about the events that brought you to use the vibrato when you play saxophone. Could you explain them again, chronologically ?