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Megan and Liz (commonly stylized as Megan & Liz) are American pop girl band composed of fraternal twin sisters, Megan and Liz Mace, from Edwardsburg, Michigan. They are both songwriters, and Megan is their guitarist.

Megan McKinley Mace and Elizabeth Morgan Mace were born on November 21, 1992 in Edwardsburg, Michigan. Megan is the older twin.^{[citation needed]}

Their first video on YouTube, entitled "This Note", is a song which they wrote aged 15. Their first cover was of "Ain't No Mountain High Enough", originally written by Nickolas Ashford & Valerie Simpson and performed by Marvin Gaye and Tammi Terrell, but better known from Diana Ross's cover in 1970. They have posted 22 original songs on YouTube (as of March 2012).

Their YouTube channel currently has over 676,000 subscribers and over 139 million video views. They are the 34th most subscribed music channel on YouTube.

The duo released their first official music video on May 20, 2011 of their self-written song "Happy Never After." Since then they have posted 5 original and official videos. Two days later, on May 22, 2011, Megan and Liz performed at the Totally Tube concert in Westbury, New York, alongside fellow YouTubers Kurt Schneider, Tiffany Alvord, Joseph Vincent, Kait Weston, and Jenna Rose.

Nathaniel Joseph "Nature" Ruess (February 26, 1982) is an American indie/indie pop singer-songwriter from Arizona. Ruess was the singer of The Format and currently lead vocalist of the band Fun.

Nate was born February 26, 1982 in Iowa City, Iowa. He was the youngest of two children, his sister Libbie being one year older.

In 1986, his family moved to a farm in Glendale, Arizona, where he remained throughout his childhood. He attended Deer Valley High School and graduated in 2000. Having an uncle, John Ruess, who performed on Broadway, Ruess was always somewhat interested in music and performing. He joined punk bands in high school and, upon graduation, chose to pursue music instead of attending college. He never took formal singing lessons or learned to play an instrument and was often told by peers that he lacked the talent to make it professionally. He took a job in a law firm as a way to support himself while he pursued his musical ambitions.

In 2001, at the age of 19, he launched the band The Format with his longtime best friend, Sam Means. This was his first musical endeavor to garner widespread attention.

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".

Pierre David Guetta (7 November 1967), known professionally as David Guetta (French pronunciation: [daˌvid ɡɛˈta]), is a French house music producer and DJ. Originally a DJ at nightclubs during the 1980s and 1990s, he co-founded Gum Productions and released his first album, Just a Little More Love, in 2002. Later, he released Guetta Blaster (2004) and Pop Life (2007). His 2009 album One Love included the hit singles "When Love Takes Over" (featuring Kelly Rowland), "Gettin' Over You" (featuring Chris Willis, Fergie & LMFAO) and "Sexy Bitch" (featuring Akon), the last becoming a top five hit in the United States and all three reaching #1 in the United Kingdom, as well as another internationally known single called "Memories" featuring Kid Cudi which became a top five hit in many countries. Guetta has sold over three million albums and 15 million singles worldwide. He is currently one of the most sought-after music producers. As at 2012 David Guetta is the world's most popular DJ, claiming the #1 poll position of the DJ Mag 100 popularity poll.