Pop music (a term that originally derives from an abbreviation of "popular") is a genre of popular music which originated in its modern form in the 1950s, deriving from rock and roll. The terms popular music and pop music are often used interchangeably, even though the former is a description of music which is popular (and can include any style).
As a genre, pop music is very eclectic, often borrowing elements from other styles including urban, dance, rock, Latin and country; nonetheless, there are core elements which define pop. Such include generally short-to-medium length songs, written in a basic format (often the verse-chorus structure), as well as the common employment of repeated choruses, melodic tunes, and catchy hooks.
Vocal music is a genre of music performed by one or more singers, with or without instrumental accompaniment, in which singing (i.e. vocal performance) provides the main focus of the piece. Music which employs singing but does not feature it prominently is generally considered instrumental music (e.g. the wordless women's choir in the final movement of Holst's The Planets) as is music without singing. Music without any non-vocal instrumental accompaniment is referred to as a cappella.
Vocal music typically features sung words called lyrics, although there are notable examples of vocal music that are performed using non-linguistic syllables, sounds, or noises, sometimes as musical onomatopoeia. A short piece of vocal music with lyrics is broadly termed a song.
Kelly Brianne Clarkson Blackstock (born April 24, 1982), better known by her maiden name Kelly Clarkson, is an American singer-songwriter, and occasional actress. In 2002, she came to prominence after winning the first season of American Idol, and has since been established as "The Original American Idol". Her debut single, "A Moment Like This", topped the US Hot 100Billboard and broke the record for the biggest jump to number one in the chart's history; it became the best-selling single of the year in the country. She became the runner-up of World Idol the following year.
Clarkson's debut studio album, Thankful (2003), has been certified 2× platinum and sold over 4.5 million copies internationally. Its lead single, "Miss Independent", became an international hit, earning Clarkson her first Grammy nomination. She developed a rock-oriented sound with her second album, Breakaway (2004). It was certified 6× platinum and sold over 15 million copies worldwide, earning Clarkson two Grammy Awards, including one for the hit single, "Since U Been Gone". She took full creative direction of her third album, My December (2007). Its lead single, "Never Again", became a top ten hit. Clarkson's fourth album, All I Ever Wanted (2009), became a critical and commercial success. Its worldwide hit single, "My Life Would Suck Without You", surpassed "A Moment Like This" for the biggest leap to number one on a single week in the history of the Billboard Hot 100 Chart from number 97, a record it still holds today. Her fifth album, Stronger (2011), generated international chart-topping singles "Mr. Know It All" and "Stronger (What Doesn't Kill You)", with the latter being the second-best selling American Idol single to date with over four million downloads in the U.S. The album won the Grammy Award for Best Pop Vocal Album, making Clarkson the first and only artist to win the award twice. In 2012, Clarkson released Greatest Hits – Chapter One; its lead single, "Catch My Breath", is her twenty-fourth entry on the Hot 100 and her eleventh million-selling single.
"Behind These Hazel Eyes" is a song recorded by American singer Kelly Clarkson for her second studio album, Breakaway (2004). It was written by Clarkson with the song's producers Max Martin and Dr. Luke. The song was released on April 12, 2005 as the second single from the album. Clarkson considered "Behind These Hazel Eyes" as one of her favorite songs and she once intended to name Breakaway after the song. "Behind These Hazel Eyes" is an uptempo pop rock song that incorporates crunchy guitars which are pulsated with driving beats and anthemic choruses; it narrates Clarkson's broken relationship with her ex-boyfriend.
"Behind These Hazel Eyes" received generally positive reviews from critics, who considered the song as a decent follow-up to Clarkson's previous single "Since U Been Gone." Critics also lauded Clarkson's vocal ability which simmers alongside the steroid-charged musical backdrop that is fun, fast and furious. Commercially, "Behind These Hazel Eyes" was successful in the United States; it peaked at number six on the Hot 100Billboard. It also became Clarkson's first song to top the Adult Pop Songs chart. It was certified platinum from Recording Industry Association of America (RIAA) for selling over one million digital downloads. Elsewhere, the song charted inside the top ten in Austria, Netherlands, New Zealand and the United Kingdom.
Science of drugs including their origin, composition, pharmacokinetics,
pharmacodynamics, therapeutic use, and toxicology.
Pharmacology (from Greek φάρμακον, pharmakon, "poison" in classic Greek; "drug" in modern Greek; and -λογία, -logia "study of", "knowledge of") is the branch of medicine and biology concerned with the study of drug action, where a drug can be broadly defined as any man-made, natural, or endogenous (within the body) molecule which exerts a biochemical and/or physiological effect on the cell, tissue, organ, or organism. More specifically, it is the study of the interactions that occur between a living organism and chemicals that affect normal or abnormal biochemical function. If substances have medicinal properties, they are considered pharmaceuticals.