Katheryn Elizabeth Hudson (born October 25, 1984), known professionally as Katy Perry, is an American singer, songwriter, and television judge. After singing in church during her childhood, she pursued a career in gospel music as a teenager.

Perry signed with Red Hill Records and released her debut studio album Katy Hudson under her birth name in 2001, which was commercially unsuccessful. She moved to Los Angeles the following year to venture into secular music after Red Hill ceased operations and she subsequently began working with producers Glen Ballard, Dr. Luke, and Max Martin.

After adopting the stage name Katy Perry and being dropped by The Island Def Jam Music Group and Columbia Records, she signed a recording contract with Capitol Records in April 2007.

Justin Randall Timberlake (born January 31, 1981), occasionally known by his initials JT, is an American singer, songwriter, actor, dancer, and record producer.

Raised in Tennessee, he appeared on the television shows Star Search and The All-New Mickey Mouse Club as a child. In the late 1990s, Timberlake rose to prominence as one of the two lead vocalists and youngest member of NSYNC, which eventually became one of the best-selling boy bands of all time.

Timberlake began to adopt a more mature image as an artist with the release of his debut solo album, the R&B-focused Justified (2002), which yielded the successful singles "Cry Me a River" and "Rock Your Body", and earned his first two Grammy Awards.

Taylor Alison Swift is an American singer-songwriter. She is known for narrative songs about her personal life, which have received widespread media coverage. At age 14, Swift became the youngest artist signed by the Sony/ATV Music publishing house and, at 15, she signed her first record deal.

Her 2006 eponymous debut album was the longest-charting album of the 2000s in the US. Its third single, "Our Song", made her the youngest person to single-handedly write and perform a number-one song on the Billboard Hot Country Songs chart. Swift's second album, Fearless, was released in 2008.

Buoyed by the pop crossover success of the singles "Love Story" and "You Belong with Me", it became the US' best-selling album of 2009 and was certified diamond in the US. The album won four Grammy Awards, and Swift became the youngest Album of the Year winner.