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  2. List of record charts - Wikipedia

    en.wikipedia.org/wiki/List_of_record_charts

    A record chart, also known as a music chart, is a method of ranking music judging by the popularity during a given period of time. Although primarily a marketing or supermarketing tool like any other sales statistic, they have become a form of popular media culture in their own right. Record charts are compiled using a variety of criteria.

  3. List of Billboard number-one singles of the 1940s - Wikipedia

    en.wikipedia.org/wiki/List_of_Billboard_number...

    Billboard Hot 100 & Best Sellers in Stores number-one singles by decade Before August 1958 1940–1949 1950–1958 After August 1958 1958–1969 1970–1979 1980–1989 1990–1999 2000–2009 2010–2019 2020–2029 US Singles Chart Billboard magazine Billboard number-one singles chart (which preceded the Billboard Hot 100 chart), which was updated weekly by the Billboard magazine, was the ...

  4. Timeline of chart shows on UK radio - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_chart_shows_on...

    18 April – The Official 1 FM Album Chart show is broadcast for the first time. Presented by Lynn Parsons, the 60-minute programme is broadcast on Sunday evenings, straight after the Top 40 singles chart. 2 May – As part of its launch schedule, new national commercial station Virgin 1215 launches a weekly album chart show.

  5. List of UK top-ten singles in 2025 - Wikipedia

    en.wikipedia.org/wiki/List_of_UK_top-ten_singles...

    The UK Singles Chart is one of many music charts compiled by the Official Charts Company that calculates the best-selling singles of the week in the United Kingdom. [1] Since 2004 the chart has been based on the sales of both physical singles and digital downloads, with airplay figures excluded from the official chart.

  6. Top 40 - Wikipedia

    en.wikipedia.org/wiki/Top_40

    In the music industry, the Top 40 is a list of the 40 currently most popular songs in a particular genre. It is the best-selling or most frequently broadcast popular music. Record charts have traditionally consisted of a total of 40 songs. "Top 40" or "contemporary hit radio" is also a radio format.

  7. Contemporary hit radio - Wikipedia

    en.wikipedia.org/wiki/Contemporary_hit_radio

    Contemporary hit radio (also known as CHR, contemporary hits, hit list, current hits, hit music, top 40, or pop radio) is a radio format that is common in many countries that focuses on playing current and recurrent popular music as determined by the Top 40 music charts.

  8. Conversion of scales of temperature - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_scales_of...

    This is a collection of temperature conversion formulas and comparisons among eight different temperature scales, several of which have long been obsolete.. Temperatures on scales that either do not share a numeric zero or are nonlinearly related cannot correctly be mathematically equated (related using the symbol =), and thus temperatures on different scales are more correctly described as ...

  9. CHUM Chart - Wikipedia

    en.wikipedia.org/wiki/CHUM_Chart

    The CHUM Chart is a long-running Canadian hit parade countdown radio show, originally aired on Toronto radio station CHUM AM then later revived on its sister station CHUM-FM. It consisted of 50 top tunes from May 1957 to July 1968, but in August 1968, the top 50 song list was reduced to 30 top songs until the final hit parade was issued in June ...