[1] She collaborated with many jazz musicians including Miles Davis, Dizzy Gillespie, Toots Thielemans, Ron Carter, Carmen McRae, Wynton Marsalis and others.

Horn had recorded with violinist Stuff Smith in Washington, D.C., in 1959, as a pianist in one of the rhythm sections featured on Cat on a Hot Fiddle.

Unfortunately for Horn, Verve Records did not include her name on the album's list of backing musicians, and the experience did not raise her professional profile.

On her two Mercury LPs, Horn was placed in a traditional pop setting with medium-sized jazz orchestra, and on neither album did she play piano.

[5] Though she had recorded a song by The Beatles on Travelin' Light, Horn for the most part resisted efforts to remake her into a popular singer in the mid-1960s, later saying of such attempts "I will not stoop to conquer.

In 1986, Horn signed a one-record deal with CBS-Sony for the Japanese market and released All of Me, a studio session recorded in New York City with her regular rhythm section, plus guest Frank Wess on three tracks.

Don Heckman wrote in the Los Angeles Times (February 2, 1995) about "the importance of bassist Charles Ables and drummer Steve Williams to Horn's sound.

Her albums Here's to Life, Light Out of Darkness (A Tribute to Ray Charles) and I Love You, Paris all reached number one on the Billboard jazz chart.

[8] She was officially recognized by the 109th US Congress for "her many achievements and contributions to the world of jazz and American culture", and performed at The White House for several U.S. presidents.