Title: Billboard (magazine)
Content: 1940, it introduced "Chart Line", which tracked the best-selling records, and was followed by a chart for jukebox records in 1944 called Music Box Machine charts. By the 1940s, "Billboard" was more of a music industry specialist publication. The number of charts it published grew after World War II, due to a growing variety of music interests and genres. It had eight charts by 1987, covering different genres and formats, and 28 charts by 1994. By 1943, "Billboard" had about 100 employees. The magazine's offices moved to Brighton, Ohio in 1946, then to New York City in 1948. A five-column

Title: Music history of the United States in the 1960s
Content: recorded songs issued after their deaths) and enjoyed strong followings for many years. The 1960s began a trend toward a proliferation of No. 1 hits on the "Billboard" Hot Country Singles chart, thanks to ever-changing data collecting methods. When the 1960s decade opened, there were but four No. 1 songs topping the chart (five, if one counts Marty Robbins' "El Paso"), but by the mid-1960s, there were always at least a dozen songs topping the chart annually. In 1967, there were more than 20 songs reaching the top spot for the first time ever in a single calendar year ...

Title: Billie Holiday
Content: 1930s. In 1940, "Billboard" began publishing its modern pop charts, which included the Best Selling Retail Records chart, the precursor to the Hot 100. None of Holiday's songs placed on the modern pop charts, partly because "Billboard" only published the first ten slots of the charts in some issues. Minor hits and independent releases had no way of being spotlighted. "God Bless the Child", which went on to sell over a million copies, ranked number 3 on "Billboard"s year-end top songs of 1941. On October 24, 1942, "Billboard" began issuing its R&B charts. Two of Holiday's songs placed on the

Title: 1991 in music
Content: Twist," which was No. 1 in 1960 & 1962). It is also the only time a single has gone to number one more than once on the UK Christmas charts. It has now spent a total of 14 weeks on top of the UK charts. During the year, "Billboard" Magazine started using Nielsen Soundscan for its sales source for the music charts. Nielsen SoundScan began tracking sales data for "Nielsen" on March 1, 1991. The May 25 issue of "Billboard" published "Billboard" 200 and Country Album charts based on SoundScan "piece count data," and the first Hot 100 chart to

Title: American Top 40
Content: Billboard charts. In 1972, 1973 and 1977, as well as 1980-1984 and 1990-1994, AT40 compiled its own year-end chart. These charts were often close to Billboard's, but AT40 would use a mid-December to early-December time period while Billboard's survey year varied from year to year. AT40 matched Billboard's #1 year-end song every year except 1977, 1984, 1990 and 1993. With the show's revival in 1998, a new chart was implemented, the top 40 portion of "Radio and Records" CHR/Pop top 50 chart, which was already in use on "Casey's Top 40". This chart used a recurrent rule that removed songs

Question: In which decade did Billboard magazine first publish and American hit chart?
Answer: 30s