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".

Bruce Frederick Joseph Springsteen (born September 23, 1949), nicknamed "The Boss," is an American singer-songwriter-performer who records and tours with the E Street Band. Springsteen is widely known for his brand of heartland rock, poetic lyrics, and Americana sentiments centered on his native New Jersey.

Springsteen's recordings have included both commercially accessible rock albums and more somber folk-oriented works. His most successful studio albums, Born in the U.S.A. and Born to Run, showcase a talent for finding grandeur in the struggles of daily American life; he has sold more than 65 million albums in the United States and more than 120 million worldwide and he has earned numerous awards for his work, including 21 Grammy Awards, two Golden Globes and an Academy Award. He is widely regarded by many as one of the most influential songwriters of the 20th century, and in 2004, Rolling Stone ranked him as the 23rd Greatest Artist of all time.

Springsteen was born in Long Branch, New Jersey, and spent his childhood and high school years in Freehold Borough. He lived on South Street in Freehold Borough and attended Freehold Borough High School. His father, Douglas Frederick Springsteen, was of Dutch and Irish ancestry and worked, among other vocations, as a bus driver, although he was frequently unemployed; his surname is Dutch for jump stone. His mother, Adele Ann (née Zerilli), was a legal secretary and was of Italian ancestry. His maternal grandfather was born in Vico Equense, a city near Naples. He has two younger sisters, Virginia and Pamela. Pamela had a brief film career, but left acting to pursue still photography full time; she took photos for the Human Touch and Lucky Town albums.

Sir James Paul McCartney, MBE, Hon RAM, FRCM (born 18 June 1942) is an English musician, singer-songwriter and composer. Formerly of the Beatles (1960–1970) and Wings (1971–1981), he has been described by Guinness World Records as "The Most Successful Composer and Recording Artist of All Time", with 60 gold discs and sales of over 100 million albums and 100 million singles. With John Lennon, George Harrison, and Ringo Starr, he gained worldwide fame as a member of the Beatles, and with Lennon formed one of the most celebrated songwriting partnerships of the 20th century. After leaving the Beatles, he began a solo career and later formed the band Wings with his first wife, Linda Eastman, and singer-songwriter Denny Laine.

According to the BBC, his Beatles song "Yesterday" has been covered by over 2,200 artists—more than any other song. Wings' 1977 release, "Mull of Kintyre", became one of the best-selling singles ever in the UK, and he is "the most successful songwriter" in UK chart history, according to Guinness. As a songwriter or co-writer, he is included on thirty-one number one titles on the Billboard Hot 100, and as of 2012 he has sold over 15.5 million RIAA certified units in the United States.