National Barn Dance, broadcast by WLS-AM

WLS (AM)

WLS is a Chicago clear-channel AM station on 890 kHz. It uses C-QUAM AM stereo and transmits with 50,000 watts from transmitter and towers on the south edge of Tinley Park, Illinois....

 in Chicago, Illinois starting in 1924, was one of the first American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 country music

Country music

Country music is a popular American musical style that began in the rural Southern United States in the 1920s. It takes its roots from Western cowboy and folk music...

 radio

Radio

Radio is the transmission of signals through free space by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space...

 programs and a direct precursor of the Grand Ole Opry

Grand Ole Opry

The Grand Ole Opry is a weekly country music stage concert in Nashville, Tennessee, that has presented the biggest stars of that genre since 1925. It is also among the longest-running broadcasts in history since its beginnings as a one-hour radio "barn dance" on WSM-AM...

.

It also set the stage for other similar programs, in part because the clear-channel signal of WLS could be received throughout most of the Midwest and even beyond in the late evening and nighttime hours, making much of the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 (and Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

) a potential audience.