The Hot 100 Airplay chart (or Radio Songs on Billboard.com) is a chart released weekly by Billboard magazine in the United States. It measures radio airplay, and is one of the three component charts, along with the Hot Singles Sales and the Hot Digital Songs charts, that determine the chart positions of singles on the Billboard Hot 100.

The Hot 100 Airplay chart is a weekly chart that ranks the 100 songs with the most airplay points (frequently referred to as audience impressions, which is a calculation of the number of times a song is played and the audience size of the station playing the tune). A song can pick up an airplay point every time it is selected to be played on specific radio stations that Billboard monitors. Radio stations across the board are used, from Top 40 Mainstream (which plays a wide variety of music that is generally the most popular songs of the time) to more genre-specific radio stations such as urban radio and country music.

During the early years of the chart, only airplay data from top 40 radio stations (mainstream, adult pop and rhythmic), adult contemporary and modern rock formats are compiled to generate the chart. However, starting from chart issue of December 5, 1998, the chart profile has expanded to include airplay data from radio stations of other formats such as R&B, rock and country. To preserve the notion of the former chart, Top 40 Tracks chart was introduced on the same week.

The Billboard Hot 100 is the United States music industry standard singles popularity chart issued weekly by Billboard magazine. Chart rankings are based on radio play and sales; the tracking-week for sales begins on Monday and ends on Sunday, while the radio play tracking-week runs from Wednesday to Tuesday. A new chart is compiled and officially released to the public by Billboard on Thursday. Each chart is dated with the "week-ending" date of the Saturday two weeks after. Example:

The first number one song of the Hot 100 was "Poor Little Fool" by Ricky Nelson on August 4, 1958. As of the issue for the week ending June 9, 2012, the Hot 100 has had 1,015 different number-one hits. Its current number-one is "Somebody That I Used to Know" by Gotye featuring Kimbra.

What has always been known as the Hot 100 had existed for nearly fifteen years as numerous charts, tracking and ranking the most popular singles of the day in several areas. During the 1940s and 1950s, popular singles were ranked in three significant charts:

Taylor Alison Swift (born December 13, 1989) is an American singer-songwriter and occasional actress. Raised in Wyomissing, Pennsylvania, Swift moved to Nashville, Tennessee at the age of fourteen to pursue a career in country music. She signed to the independent label Big Machine Records and became the youngest songwriter ever hired by the Sony/ATV Music publishing house. The release of Swift's self-titled debut album in 2006 established her as a country music star. "Our Song", her third single, made her the youngest sole writer and singer of a number one song on the country chart. She received a Best New Artist nomination at the 50th Grammy Awards.

Swift's second album, Fearless, was released in late 2008. Buoyed by the chart success of the singles "Love Story" and "You Belong with Me", Fearless attracted a crossover audience and became the top-selling album of 2009. The record won four Grammy Awards, with Swift becoming the youngest ever Album of the Year winner. Fearless also received Album of the Year plaudits at the American Music Awards, Academy of Country Music Awards and Country Music Association Awards, making it the most awarded album in country music history. In 2010, Swift released her third album, Speak Now, which sold over one million copies in its first week. She then embarked on the 111-date Speak Now World Tour, which was attended by over 1.6 million fans and has become one of the highest-grossing concert tours of all time. The album's third single, "Mean", won two Grammy Awards for Best Country Song and Best Country Solo Performance. Swift is currently recording her fourth studio album, due for release in the fall of 2012.

Deborah Cox (born July 13, 1974) is a Canadian R&B singer-songwriter and actress. Her 1998 song "Nobody's Supposed to Be Here" held the record for longest-running number one single on Billboard's Hot R&B/Hip-Hop Singles & Tracks chart (14 weeks), a record held for nearly eight years. She has achieved eleven number-one hits on Billboard's Hot Dance Club Play chart. She is often cited as Canada's top R&B artist.

Deborah Cox was born in Toronto to parents of Afro-Guyanese descent, grew up in Scarborough, Toronto and attended John XXIII Catholic Elementary School and Earl Haig Secondary School. She began singing for TV commercials at age 12, and entered various talent shows with the help of her mother. She performed in nightclubs as a teenager, and began to write music around the same time. Cox entered the music industry in the early 1990s, performing as a backup vocalist for Celine Dion for six months. After receiving many rejection letters from Canadian record labels that claimed their "quota" had been reached, Cox moved to Los Angeles in 1994 with producer and songwriting partner, Lascelles Stephens.

Janet Damita Jo Jackson (born May 16, 1966) is an American recording artist and actress. Known for a series of sonically innovative, socially conscious and sexually provocative records, as well as elaborate stage shows, television and film roles, she has been a prominent figure in popular culture for over 25 years. The youngest child of the Jackson family, she began her career with the variety television series The Jacksons in 1976 and went on to appear in other television shows throughout the 1970s and early 1980s, including Good Times and Fame.

After signing a recording contract with A&M in 1982, she came to prominence following the release of her third studio album Control (1986). Her collaborations with record producers Jimmy Jam and Terry Lewis incorporated elements of rhythm and blues, funk, disco, rap, and industrial beats, which led to crossover appeal in popular music. In addition to receiving recognition for the innovation in her records, choreography, music videos, and prominence on radio airplay and MTV, she was acknowledged as a role model for her socially conscious lyrics.