For any kid who grew up in the 60s, radio was a huge part of their life. It's not like today. Back then if you were a teenager, radio was your constant companion. You had a favorite station, knew all the disc jockeys, could sing their jingles. It was a shared experience.

And one station revolutionized top 40. KHJ Los Angeles became "Boss Radio" in April of 1965. Its streamlined...