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".

Jessica Hilda Mauboy (born 4 August 1989), is an Indigenous Australian R&B singer, songwriter and actress. In 2006, Mauboy was the runner-up on the fourth season of Australian Idol, she had auditioned for the talent show in Alice Springs to pursue a recording career. Mauboy subsequently signed a contract with Sony Music Australia.

In February 2007, she released her debut live album, The Journey, which reached number four on the ARIA Albums Chart, and was certified gold by the Australian Recording Industry Association (ARIA). The album contained selected songs Mauboy performed as part of the top 12 on Australian Idol. Later that year, she briefly became a member of all-girl pop group Young Divas, before resuming her solo career early in 2008. Mauboy released her debut studio album, Been Waiting, in November 2008, which spawned her first number-one single, "Burn", as well as the album's other top 10 hits, "Running Back" and "Because". In 2010, Been Waiting was certified double platinum by the ARIA, for shipments of 140,000 units, and became the second highest-selling Australian album of 2009. At the 2009 ARIA Music Awards, Mauboy earned seven nominations for the album and singles; she won 'Highest Selling Single' for "Running Back".

The Veronicas are a rock band from Brisbane, Australia, formed in 1999 by twin sisters, Jessica and Lisa Origliasso. In addition to music, the sisters market their own line of clothing which debuted in 2007.

In 2005, The Veronicas released their first studio album entitled The Secret Life of... which peaked at #2 on the Australian charts and gained an Australian ARIA certification of 4x platinum for 280,000+ sales. In total, the album spawned five singles, three of which were top ten singles in Australia.

In 2007, the duo released their second studio album, Hook Me Up, which also peaked at #2 on the Australian charts and earned an Australian ARIA certification of 2x platinum for 140,000+ sales. To date, the album has garnered four Australian top ten singles. The album's title track, "Hook Me Up", was The Veronicas' first #1 single in Australia.

In 2004, Lisa Origliasso and Jessica Origliasso were introduced to the Music Director of The Bell Hughes Music Group (BHMG), Hayden Bell. After producing some demo recordings with the twins, Bell invited them to sign a publishing agreement with Excalibur Productions (a subsidiary of BHMG). In the process, Bell helped facilitate their progression in musical style from acoustic pop to the more rhythmic rock pop approach that is now their trademark. On the strength of these demos, Bell took them to meet the executives at Engine Room (a subsidiary of PBL (Packer) Group) and they were immediately signed to a production deal. To further develop their song writing skills, Bell connected them with several internationally acclaimed songwriters and producers including Clif Magness (who has written with Avril Lavigne), Billy Steinberg (Madonna, Cyndi Lauper), Max Martin (Britney Spears, Katy Perry, P!nk), Eric Nova, Dead Mono and Vince DeGiorgio, where they created a catalogue of over 50 songs.