Hartman recorded four solo albums between 1976 and 1987 – two for Kirshner Records, one for RCA Records and one for Atlantic Records. Her most notable song is "If Love Must Go", which she performed on various television shows like Solid Gold and The Merv Griffin Show. Despite additional contributions from successful songwriters and producers including Jeff Barry, Dobie Gray, Bryan Adams, Rick Springfield, Will Jennings, and Holly Knight, the albums were not commercially successful. She achieved her most notable success with a duet with her husband entitled "When I Said I Do". It reached Number 1 on the Billboard Hot Country Singles & Tracks charts on December 18, 1999 and was nominated for a Grammy Award. The duet was ranked #11 on CMT's 100 Greatest Duets in Country Music in 2005. They recorded a second duet titled "Easy For Me to Say", which peaked at #27 on the country music charts in 2002.