WThe GfK Entertainment charts are record charts compiled by GfK Entertainment on behalf of the German record industry. They include the "Single Top 100" and the "Album Top 100" chart. The chart week runs from Friday to Thursday, and the chart compilations are published on Tuesday for the record industry. The entire top 100 singles and top 100 albums are officially released the following Friday by GfK Entertainment. The charts are based on sales of physical singles and albums from retail outlets as well as permanent music downloads.
WThe Billboard Global 200 is a chart that ranks the best-performing songs globally. Its data, published by Billboard magazine and compiled by MRC Data, is based on digital sales and online streaming from over 200 territories worldwide. Another similar chart is the Billboard Global Excl. U.S. chart, which follows the same formula except it covers all territories excluding the US.
WThe M Countdown Chart is a record chart on the South Korean Mnet television music program M Countdown. Every week, the show awards the best-performing single on the chart in the country during its live broadcast.
WThe Music Bank Chart is a record chart on the South Korean KBS television music program Music Bank. Every week, the show awards the best-performing single on the chart in the country during its live broadcast.
WThe Inkigayo Chart is a music program record chart on Seoul Broadcasting System (SBS) that gives an award to the best-performing single of the week in South Korea. The chart measures digital performance in domestic online music services (55%), social media via YouTube views (30%), album sales (10%), network on-air time (10%), and advanced viewer votes (5%) in its ranking methodology. Beginning on January 24, Inkigayo implemented real-time voting via the Starpass mobile app accounting for an additional 5%.
WThe Show Champion Chart is a record chart on the South Korean MBC M television music program Show Champion. Every week, the show awards the best-performing single on the chart in the country during its live broadcast.
WThe Show! Music Core Chart is a record chart on the South Korean MBC television music program Show! Music Core. Every week, the show awards the best-performing single on the chart in the country during its live broadcast.
WThe Show Chart is a music program record chart on SBS MTV that gives an award to the best-performing single of the week in South Korea.
WThe UK R&B Albums Chart is a weekly chart, first introduced in October 1994, that ranks the 40 biggest-selling albums that are classified in the R&B genre in the United Kingdom. The chart is compiled by the Official Charts Company, and is based on sales of CDs, downloads, vinyl and other formats over the previous seven days.
WThe UK R&B Singles Chart is a weekly chart that ranks the 40 biggest-selling singles and albums that are classified in the R&B genre in the United Kingdom. The chart is compiled by the Official Charts Company, and is based on both physical, and digital sales.
WThe UK Albums Chart is one of many music charts compiled by the Official Charts Company that calculates the best-selling albums of the week in the United Kingdom. Since 2004 the chart has been based on the sales of both physical albums and digital downloads. Since 2015, the album chart has been based on both sales and streaming. This list shows albums that peaked in the top ten of the UK Albums Chart during 2021, as well as albums which peaked in 2020 and 2022 but were in the top 10 in 2021. The entry date is when the album appeared in the top 10 for the first time.
WThe 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. 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. Since 2014, the singles chart has been based on both sales and streaming, with the ratio altered in 2017 to 150:1 streams and only three singles by the same artist eligible for the chart. From July 2018, video streams from YouTube Music and Spotify among others began to be counted for the Official Charts. This list shows singles that peaked in the Top 10 of the UK Singles Chart during 2021, as well as singles which peaked in 2020 but were in the top 10 in 2021. The entry date is when the song appeared in the top 10 for the first time.
WAdult Contemporary is a chart published by Billboard ranking the top-performing songs in the United States in the adult contemporary music (AC) market, based on weekly airplay data from radio stations compiled by Broadcast Data Systems.
WThis is a list of the albums ranked number one in the United States during 2021. The top-performing albums and EPs in the U.S. are ranked on the Billboard 200 chart, which is published by Billboard magazine. The data is compiled by Nielsen SoundScan based on multi-metric consumption as measured in album-equivalent units, which comprise album sales, track sales, and streams on digital music platforms. Each unit equals one album sold, or 10 individual digital tracks sold from an album, or 3,750 ad-supported or 1,250 paid/subscription on-demand official audio and video streams generated by songs from an album.
WTop Country Albums is a chart that ranks the top-performing country music albums in the United States, published by Billboard. Chart positions are based on multi-metric consumption, blending traditional album sales, track equivalent albums, and streaming equivalent albums.
WHot Country Songs and Country Airplay are charts that rank the top-performing country music songs in the United States, published by Billboard magazine. Hot Country Songs ranks songs based on digital downloads, streaming, and airplay not only from country stations but from stations of all formats, a methodology introduced in 2012. Country Airplay, which began being published in 2012, is based solely on country radio airplay, a methodology that had previously been used from 1990 to 2012 for Hot Country Songs.
WThe Billboard Digital Song Sales chart is a chart that ranks the most downloaded songs in the United States. Its data is compiled by Nielsen SoundScan based on each song's weekly digital sales, which combines sales of different versions of a song by an act for a summarized figure.
WThe Billboard Hot 100 is a chart that ranks the best-performing songs in the United States. Its data is compiled by MRC Data and published by American music magazine Billboard. The chart is based on each song's weekly physical and digital sales collectively, the amount of airplay it receives on American radio stations, and its streams on online digital music platforms.
WThe Billboard Hot 100 is a chart that ranks the best-performing singles of the United States. Its data, published by Billboard magazine and compiled by Nielsen SoundScan, is based collectively on each single's weekly physical and digital sales, as well as airplay and streaming. At the end of a year, Billboard will publish an annual list of the 100 most successful songs throughout that year on the Hot 100 chart based on the information. For 2021, the list was published on December 2, calculated with data from November 21, 2020 to November 13, 2021.