This film will investigate the prolific musical period that begins in the middle of the 1960s and continues to the beginning of the 21st century: a half a century of music history in the United States and UK. This motion picture won't be the portrait of the person who'll serve as the "leitmotif" of this survey - even if this film will be based on the passionate viewpoints of Daniel Caux, who at the same time is a musicologist, essayist, activist, radioman, promoter and friend of the musicians who will be the subject of this film -, but rather the portrait of a particularly astounding era.