FM radio turns 60 in the USA

In the USA the Federal Communications Commission (FCC) had adopted a standard for FM stereo broadcasts in April 1961, after about two years of field testing, but the agency specified that stations couldn’t start broadcasting until midnight local time on June 1.
An hour after WGFM’s first FM programming went life, WEFM in Chicago, Illinois started its broadcast, followed two hours later by KMLA in Los Angeles, California.
Today, there are more than 10,000 FM radio stations broadcasting in the U.S. alone, and the average person spends about an hour and 40 minutes listening to radio every day.