Jacques Dutronc celebrates his 80th birthday this Friday, April 28. After more than half a century on stage, the singer has marked several generations.

The journalist Olivier Cachin, author of the book "DUTronc, a life in songs", tells the microphone of Europe 1 an anecdote about one of his songs. "Trying to understand Jacques is like chasing the wind," said Françoise Hardy. "There are plenty of contradictions, mysteries. He is both shy and cynical, very playboy, very discreet"