Amos won a county teen talent contest in 1977, singing a song called "More Than Just a Friend". As a senior at Richard Montgomery High School, she co-wrote "Baltimore" with her brother, Mike Amos, for a competition involving the Baltimore Orioles. The song did not win the contest but became her first single, released as a 7-inch single pressed locally for family and friends in 1980 with another Amos-penned composition as a B-side, "Walking With You". Before this, she had performed under her middle name, Ellen, but permanently adopted Tori after a friend's boyfriend told her she looked like a Torrey pine, a tree native to the West Coast.