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A graduate of Brigham Young University (BYU), she and BYU classmate Sandi Griffiths joined The Lawrence Welk Show in 1968 as the singing act of Sandi & Salli. The duo was very popular on the show until late 1972, when Sally left to pursue a solo career on Broadway.
On December 6, 1974, she married Clay Hart, a country singer who was on the Welk show from 1969 to 1975, and shortly afterwards she and Clay also started singing together professionally; often as opening acts for performers such as Red Skelton, Juliet Prowse and Mel Tillis. The Harts have also released several albums, owned a tote bag business—Get Sack—and have hosted their own show on The Nashville Network called Remodeling & Decorating Today.
They also appeared in wraparound segments for reruns of the Welk Show on PBS and have toured the United States with their fellow Welk stars in the Forever Blowing Bubbles concert series. Today, the Harts make their home in Melbourne, Florida, where she sings frequently with the Melbourne Swingtime Band and other local groups. Flynn is a Latter-day Saint.