A door is a movable structure used to open and close off an entrance, typically consisting of a panel that swings on hinges or that slides or rotates inside a space.

When open, doors admit ventilation and light. The door is used to control the physical atmosphere within a space by enclosing the air drafts, so that interiors may be more effectively heated or cooled. Doors are significant in preventing the spread of fire. They also act as a barrier to noise.

They are also used to screen areas of a building for aesthetics, keeping formal and utility areas separate. Doors also have an aesthetic role in creating an impression of what lies beyond. Doors are often symbolically endowed with ritual purposes, and the guarding or receiving of the keys to a door, or being granted access to a door can have special significance. Similarly, doors and doorways frequently appear in metaphorical or allegorical situations, literature and the arts, often as a portent of change.

Architectural doors have numerous general and specialized uses. Doors are generally used to separate interior spaces (rooms, closets, etc.) for privacy, convenience, security, and safety reasons. Doors are also used to secure passages into a building from the exterior for reasons of safety and climate control.

Bernard Charles "Bernie" Ecclestone (born 28 October 1930) is an English business magnate, as president and CEO of Formula One Management and Formula One Administration and through his part-ownership of Alpha Prema, the parent company of the Formula One Group of companies. As such, he is generally considered the primary authority in Formula One racing. He is most commonly addressed in tabloid journalism as "F1 Supremo". His early involvement in the sport was as a competitor and then as a manager of drivers Stuart Lewis-Evans and Jochen Rindt. In 1972, he bought the Brabham team, which he ran for fifteen years. As a team owner he became a member of the Formula One Constructors Association. His control of the sport, which grew from his pioneering the sale of television rights in the late 1970s, is chiefly financial, but under the terms of the Concorde Agreement he and his companies also manage the administration, setup and logistics of each Formula One Grand Prix. Ecclestone himself entered two Grand Prix races during the 1958 season, failing to qualify for either of them.

David Michael Letterman (born April 12, 1947) is an American television host and comedian. He hosts the late night television talk show, Late Show with David Letterman, broadcast on CBS. Letterman has been a fixture on late night television since the 1982 debut of Late Night with David Letterman on NBC. Letterman recently surpassed friend and mentor Johnny Carson for having the longest late-night hosting career in the United States of America.

Letterman is also a television and film producer. His company Worldwide Pants produces his show as well as its network follow-up The Late Late Show with Craig Ferguson. Worldwide Pants has also produced several prime-time comedies, the most successful of which was Everybody Loves Raymond, currently in syndication.

In 1996, David Letterman was ranked #45 on TV Guide's 50 Greatest TV Stars of All Time.

Letterman was born in Indianapolis, Indiana. His father, Harry Joseph Letterman (April 1915 – February 1973), was a florist of British descent; his mother Dorothy Letterman (née Hofert, now Dorothy Mengering), a Presbyterian church secretary of German descent, is an occasional figure on the show, usually at holidays and birthdays.

Neil Percival Young,OC,OM (born November 12, 1945) is a Canadian singer-songwriter who is widely regarded as one of the most influential musicians of his generation.

Young began performing as a solo artist in Canada in 1960, before moving to California in 1966, where he co-founded the band Buffalo Springfield along with Stephen Stills and Richie Furay, and later joined Crosby, Stills & Nash as a fourth member in 1969. He forged a successful and acclaimed solo career, releasing his first album in 1968; his career has since spanned over 40 years and 34 studio albums, with a continual and uncompromising exploration of musical styles. The Rock and Roll Hall of Fame website describes Young as "one of rock and roll’s greatest songwriters and performers". He has been inducted into the Hall of Fame twice: first as a solo artist in 1995, and second as a member of Buffalo Springfield in 1997.

Young's work is characterized by his distinctive guitar work, deeply personal lyrics and signature alto or high tenor singing voice. Although he accompanies himself on several different instruments, including piano and harmonica, his idiosyncratic electric and clawhammer acoustic guitar playing are the defining characteristics of a varyingly ragged and melodic sound. While Young has experimented with differing music styles, including swing and electronic music throughout a varied career, his best known work usually falls into two primary styles: acoustic (folk and country rock) and electric (amplified hard rock, very often in collaboration with the band Crazy Horse). Young has also adopted elements from newer styles such as alternative rock and grunge. His influence on the latter caused some to dub him the "Godfather of Grunge".

Ermias Asghedom, better known by his stage name Nipsey Hussle, is a West Coast rapper from Los Angeles, California.

Nipsey's first recorded mixtape, was Slauson Boy Volume 1, and soon became the name of his own record label. In 2008 Nipsey released two mixtapes, Bullets Ain't Got No Name, Vol. 1 and Vol. 2, before signing with Epic Records. In 2009, his debut single, "Hussle In The House", was released.

In 2009 he released a third mixtape, Bullets Ain't Got No Name, Vol. 3. He appeared with Drake on the song "Killer" and on the song "Upside Down" on Snoop Dogg's album Malice n Wonderland. A first studio album, South Central State of Mind, was expected in the summer of 2009 but was never released; it has been postponed indefinitely. The Marathon was released instead on December 21, 2010.^{[citation needed]}

In 2010 he appeared on the song "We Are the World 25 for Haiti". He was chosen as one of XXL Magazine's "Annual Freshman Top Ten", a selection of ten up-and-coming artists as "Most Determined" And continues to have success with the release of his new single "Feelin Myself" featuring Lloyd. The first single off The Marathon mixtape is "Keys to the City" (Produced By E.N.G. & Djay Cas). He made a guest appearance on fellow rapper YG's 2012 single "Bitches Ain't", also featuring Young Money member Tyga. It debuted on the Hot 100 at #100 and on the Heatseekers Songs chart at #11.