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A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
Before the Billboard Hot 100 chart was established in August 1958, which was based on a formula combining sales data of commercially available singles and airplay on American radio stations, the Billboard used to publish several song popularity charts weekly. Throughout most of the 1940s the magazine published the following three charts:
Hot Country Songs is a chart that ranks the top-performing country music songs in the United States, published by Billboard magazine. In 2008, 26 different songs topped the chart in 52 issues of the magazine, based on weekly airplay data from country music radio stations compiled by Nielsen Broadcast Data Systems. [1]
Component charts have become an increasingly important way to measure the commercial success of individual songs. Reviewers often describe records using round number milestones within a chart. For example, a record that peaks at number 7 may be called a "Top 10" hit , even when there is no chart limited to only the top 10 records in that ...
Billboard magazine is the provider of US charts; however, its use on Wikipedia when mentioning charts should be limited: i.e., charts should simply be referred to as US followed by the chart name. The only two exceptions to this rule are the Billboard Hot 100 and the Billboard 200, which should include Billboard as it is a part of the actual ...
During the 1980s the chart was based collectively on each single's weekly physical sales figures and airplay on American radio stations. George Michael was the only artist to achieve two year-end Billboard Hot 100 number-one singles in the 1980s. He achieved this with his songs "Faith" and "Careless Whisper".