Hot Country Songs is a chart published weekly by "Billboard" magazine in the United States. 

This 50-position chart lists the most popular country music songs, calculated weekly by collecting airplay data from Nielsen BDS along with digital sales and streaming. 

The current number-one song, as of the chart dated for October 7, 2017, is "Body Like a Back Road" by Sam Hunt. 

"Billboard" began compiling the popularity of country songs with its January 8, 1944 issue. Only the genre's most popular jukebox selections were tabulated, with the chart titled "Most Played Juke Box Folk Records". The chart length was not standardized; a given week had anywhere from two to eight positions. 

For approximately ten years, from 1948 to 1958, "Billboard" used three charts to measure the popularity of a given song. In addition to the jukebox chart, these charts included: 

The names of each chart changed slightly during each chart's life. The "jukebox" chart – which by 1956 was known as "Most Played C&W in Juke Boxes" – ended on June 17, 1957. The "best sellers" and "jockeys" charts continued until October 13, 1958. 

Starting with the October 20, 1958 issue, "Billboard" began combining sales and radio airplay in figuring a song's overall popularity, counting them in one single chart called "Hot C&W Sides". The chart began with a standard length of 30 positions each week. The name of the chart, and the number of positions varied through the years: Its name was switched to "Hot Country Singles" on November 3, 1962; it was expanded to 50 slots on January 11, 1964; then 75 on October 15, 1966; and finally 100 beginning July 14, 1973.
what is the number one song on the Hot Country Songs chart in this article?
as of what date?
how many positions are on that chart?
does it include streaming data too?
who publishes it?
is that a tv show?
what is it?
when did they start tracking the popularity of country songs?
what three charts did they use to measure a songs popularity?
how long did they use those for?
what years did it span?
when did the jukebox chart end?
did the other charts end at the same time?
when did they end?
how many positions did the new C&W chart have?
when did they start that?
did they ever expand the position count?
to what?
what was the chart named in 1962?
"Body Like a Back Road"
The current number-one song, as of the chart dated for October 7, 2017, is "Body Like a Back Road" by Sam Hunt. 
October 7, 2017

The current number-one song, as of the chart dated for October 7, 2017, is "Body Like a Back Road" by Sam Hunt. 
50
This 50-position chart
yes
calculated weekly by collecting airplay data from Nielsen BDS along with digital sales and streaming. 
"Billboard"
Hot Country Songs is a chart published weekly by "Billboard" magazine in the United States. 
no
 "Billboard" magazine
magazine
 "Billboard" magazine
January 8, 1944
"Billboard" began compiling the popularity of country songs with its January 8, 1944 issue
"jukebox", "best sellers" and "jockeys"
The "jukebox" chart – which by 1956 was known as "Most Played C&W in Juke Boxes" – ended on June 17, 1957. The "best sellers" and "jockeys" charts continued until October 13, 1958. 
For approximately ten years
For approximately ten years
1948 to 1958
For approximately ten years, from 1948 to 1958
June 17, 1957
The names of each chart changed slightly during each chart's life. The "jukebox" chart – which by 1956 was known as "Most Played C&W in Juke Boxes" – ended on June 17, 1957
no
 The "best sellers" and "jockeys" charts continued until October 13, 1958.
October 13, 1958.
 The "best sellers" and "jockeys" charts continued until October 13, 1958.
30
The chart began with a standard length of 30 positions 
October 20, 1958
Starting with the October 20, 1958
yes
Its name was switched to "Hot Country Singles" on November 3, 1962; it was expanded to 50 slots on January 11, 1964; then 75 on October 15, 1966; and finally 100 beginning July 14, 1973.
50, 75, and 100
 it was expanded to 50 slots on January 11, 1964; then 75 on October 15, 1966; and finally 100 beginning July 14, 1973.
"Hot Country Singles"
Its name was switched to "Hot Country Singles" on November 3, 1962