Magness worked with Lavigne on her multi-platinum debut album,
Let Go, co-writing five tracks and producing 6, including "Losing Grip",
Mobile, "Unwanted", "My World", and "Too Much to Ask".
Let Go reached the top of the albums chart in
Canada and the
U.K., as high as #2 on the
Billboard 200, and finished the year at #14 on
Billboard's 200 Albums for 2002. Prior to leaving New York for Los Angeles to collaborate with Magness, Lavigne was assigned cowriters by her label, Arista, who "failed to click with a girl who'd just discovered guitar-based rock". Magness gave Lavigne the creative freedom she desired. "The harder-rocking songs on
Let Go – specifically 'Losing Grip' and 'Unwanted' – had the sound she wanted for the whole album." Following up his collaboration with Lavigne, Magness went on to work with original
American Idol winner
Kelly Clarkson on her debut album
Thankful. The #1 album featured two productions by Magness. He co-wrote and produced two songs from Clarkson's multi-platinum second album,
Breakaway. Magness also produced five songs for another American Idol contestant,
Clay Aiken, on his debut album,
Measure of a Man, including the single "Solitaire", which topped the
2004 Canadian chart for 4 weeks. Magness produced the longest radio air played song in Australian history, "
Perfect", for
Vanessa Amorosi. Magness co-wrote the first single "
Lights Out" and five other songs with
Lisa Marie Presley from her debut album,
To Whom It May Concern. The album debuted at No. 5 on the Billboard 200 album chart. Early in his career, Magness co-wrote and produced the title track "
All I Need" on
Jack Wagner's debut album
All I Need. In 1985, the song spent 2 weeks at the top of
Billboard's
Adult Contemporary chart. In 1990, Magness' collaboration with songwriter
Steve Kipner resulted in a Billboard top 5 single for
Wilson Phillips' "
Impulsive". Magness has either co-written and/or produced tracks for
Celine Dion,
Jessica Simpson,
Amy Grant, Billy Idol,
Hanson,
Steve Perry,
O-Town,
Charlotte Martin,
Rachel Loy, Teddy Pendergrass,
Wild Orchid, Ted Nugent,
Judith Owen,
Jude,
Joe Bonamassa,
The Urge, Idina Menzel, Bo Bice, Clay Aiken,Evelyn "Champaigne" King,
Kyle Vincent,
Marie Digby,
Andreya Triana, Dara Sedaka, Sam Harris,
Days Difference,
Ill Scarlett, Lee Greenwood, Gob, Thelma Houston, Larry Graham,
Ivy Lies,
Christina Grimmie,
Caroline Sunshine,
Jermaine Jackson,
Barbra Streisand,
Julio Iglesias,
Sheena Easton,
George Benson, Vanessa Amorosi,
Patti Austin and
Al Jarreau. ==Awards and nominations==