Possibly CIA, through FBI, contracted as undercover informant an unsuccessful club singer of no particular importance - one of many who emerged in the wake of Bob Dylan's popularity. CIA may have asked this singer to keep tabs on goings-on in the music underground, including the drug culture and, in particular, the peace movement. In order to assure full deniability for this continental operation, rather than pay the informant out of CIA's budget, instead the informant worked in exchange for assurance that his music would fare well on the marketplace. Perhaps this was accomplished through bribes offered to well-placed disc jockeys and record company executives, suggesting a CIA-backed conspiracy within the popular music industry.
Although the singer in question did become quite successful, we have been unable to substantiate this story through any channels.