Music Hall is a type of British theatrical entertainment which was popular between 1850 and 1960. It involved a mixture of popular song, comedy, speciality acts and variety entertainment. The term is derived from a type of theatre or venue in which such entertainment took place. British music hall was similar to American vaudeville, featuring rousing songs and comic acts, while in the United Kingdom the term vaudeville referred to more working-class types of entertainment that would have been termed burlesque in America.

With its origins being found in saloon bars within public houses during the 1830s, Music hall entertainment became increasingly popular with audiences, so much so, that during the 1850s, the public houses were demolished and Music hall theatres were developed in their place. These theatres were designed, chiefly so people could consume food and alcohol and smoke tobacco in the auditorium while the entertainment took place. This differed somewhat from the conventional type of theatre which, up until then, seated the audience in stalls with a separate bar-room. Early Music halls included Canterbury Music Hall in Lambeth and The Middlesex, in Drury Lane, otherwise known as the 'Old Mo'.

Radio City can refer to several things:

Katheryn Elizabeth Hudson (born October 25, 1984), known by her stage name Katy Perry, is an American singer, songwriter and actress. Perry grew up with gospel music, and during her first year of high school she pursued a music career as Katy Hudson, releasing her first studio album called Katy Hudson which failed to chart. She recorded a solo album later, which was never released. After signing with Capitol Music Group in 2007, her fourth record label in seven years, she adopted the stage name Katy Perry.

She first gained recognition with the release of her first mainstream album, One of the Boys in 2008, which spawned three Billboard Hot 100 top-ten songs—"I Kissed A Girl", "Hot n Cold" and "Waking Up In Vegas". Perry supported the album with her Hello Katy Tour. In 2010, her third studio album, Teenage Dream (2010), which topped the Billboard 200 chart, and spawned five number one singles—"California Gurls", "Teenage Dream", "Firework", "E.T." and "Last Friday Night (T.G.I.F.)"—Teenage Dream was the only album (after Michael Jackson's Bad)—to do so, and the first female in history to achieve this milestone. She embarked on the California Dreams Tour, which grossed nearly $60 million worldwide. Perry re-released the album under the name of Teenage Dream: The Complete Confection on March 26, 2012, and the re-release has already spawned the number-one single "Part of Me".