While her early solo and band efforts did not result in commercial successes, she became a much-sought songwriter, writing or co-writing many international hit songs from 1999 to today (see discography below). Ms. DioGuardi was named BMI's Pop Songwriter of the Year. Her songs are on over 100 million records. The majority of her songs have been recorded by American females (
Ashlee Simpson, Ashley Tisdale, Britney Spears, Hilary Duff, Miley Cyrus, Christina Aguilera, Katharine McPhee, Anastacia, Pink, Lindsay Lohan, Paris Hilton and others) with a significant minority recorded by Australian females (
Kylie Minogue, Natalie Imbruglia, Delta Goodrem, The Veronicas and others). She also co-wrote a song with Canadian singer-songwriter
Avril Lavigne for her third album
The Best Damn Thing. She wrote twelve of the fourteen songs on Hilary Duff's third studio album
Dignity. DioGuardi can also be heard performing backup vocals on some of these recordings. Notable writing collaborators include
Greg Wells, John Shanks, Guy Chambers and
Steve Morales. As of 2007 DioGuardi is working on future tracks for Britney Spears. The first major song she worked one was the
Backstreet Boys I Want It That Way, but it does not appear on the production credits in either the single or the album,
Millennium or any other albums that include that song such as
The Hits: Chapter 1
Kara’s forthcoming releases include cuts with Celine Dion, Faith Hill, Backstreet Boys, Carrie Underwood, Michael Buble, Daniel Powter, Nick Lachey, Nicole Scherzinger, Britney Spears, Daniel Powter, Cheetah Girls, Ashlee Simpson, Frankie J., Clique, JC Chasez, Samantha Jade, Puddle of Mudd, I-9, and Cassie. Kara’s current writing collaborations include Chad Kroeger, Timbaland, Will.I.Am, Bryan Michael Cox, Lil’Jon, Brian Howes, Dr. Luke, Ron Fair, Chad Hugo, Danja, Brian Howes, John Shanks, Fernando Garibay, Polow Da Don, Jeffrey Steele, Craig Wiseman, Troy Verges, David Foster, Greg Wells, Mitch Allan, Dave Hodges, Ben Moody, and Marti Frederiksen.