In 1969, Leonard Bernstein described the "Symphonie Fantastique" as the first psychedelic symphony ever composed, and more than 100 years before the dawn of the movement in the late 1960s.
"...those sounds you're hearing come from the first psychedelic symphony in history, the first musical description ever made of a trip, written one hundred thirty odd years before the Beatles, way back in 1830 by the brilliant french composer Hector Berlioz. He called it "Symphonie Fantastique," or "Fantastic," and fantastic it is, in every sense of the word, including psychedelic."
Hedi Slimane discovered the "Symphonie Fantastique" at the age of 11 and became passionate about the romantic musical piece by the young Berlioz. Hector Berlioz was only 26 years old when he was in an obsessive relationship with English actress Harriet Smithson, which led him to compose the "Symphonie Fantastique" on December 5th 1830 in Paris.