Along with her sister, Aurora, and her brother, Cam, she was born and raised in Bolton, a community in Caledon, Ontario, where she studied dancing and singing from a young age.

In 2002, Sweetnam began working with Canadian producer and instrumentalist James Robertson on what would later become Noise from the Basement, her Capitol Records/EMI debut.

Sweetnam also provided the theme songs for various television shows including The Buzz on Maggie for Disney Channel, Wayside for Teletoon, and Radio Free Roscoe.

Her album Sound Soldier was released October 30, 2007; its lead single, "Human", was nominated for a 2008 MuchMusic Video Award for Best Cinematography, but lost to Hedley's "She's So Sorry".

Meanwhile, in her YouTube make-up tutorials, Sweetnam has used the songs "Rock n' Roll Baby", "Love Sugar Sweet", "Heartbreak", "Boomerang", "MuSick", and "Wolves and Witches".

Sweetnam also released a song entitled "Stay", along with "Boomerang", "MuSick" and "Wolves and Witches", on her MySpace page.

Sweetnam's song "(Let's Get Movin') Into Action" was also used in an episode of the Canadian teen drama Degrassi: The Next Generation, in one deleted scene from Bandslam, and in the films Balls Out: Gary the Tennis Coach, Hotel for Dogs, and the 2010 popular film Ramona and Beezus (starring Joey King and Selena Gomez).

As of July 2012[update], Sumo Cyco has released six singles: "Mercy", "Limp", "Interceptor", "Danger", "Loose Cannon", and a cover of Oingo Boingo's "Who Do You Want to Be?".

With each new song, Sumo Cyco would direct and put together their music videos for their YouTube channel which, as of July 2022[update], has received over seven million views.