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(XERB Studios, Rosarita, Mexico - Late 1950's)
Wolfman Jack was not technically a freeform jock, but his shows certainly weren't the norm, either. Broadcasting throughout the 1960's on mostly AM stations, Wolfman arguably became the best known DJ of the era. No matter who you were, you heard him at one time or another -- some of us, many times! Here's a site that has links to Wolfman websites and Mexican radio station XERB history:
XERB