Sarah Lois Vaughan was born March 27, 1924, in Newark, New Jersey, to Asbury "Jake" Vaughan, a carpenter who played guitar, and Ada Vaughan, who sang in the choir at New Mount Zion Baptist Church. Sarah began piano lessons at seven and grew up steeped in the church's music. By her mid-teens she was already working Newark's nightclubs as a pianist and singer, and she dropped out of Newark Arts High School during her junior year to pursue music full-time.

The turn that made her a professional came in the fall of 1942. At eighteen, on a dare, she entered Amateur Night at Harlem's Apollo Theatre and won singing "Body and Soul." The prize was ten dollars and a week's engagement; that engagement, opening for Ella Fitzgerald on November 20, 1942, put her in front of bandleader Earl Hines. Hines hired her on April 4, 1943 — officially as a pianist, a workaround that let him sign her under the musicians' union rather than the more restrictive singers' union. The Hines orchestra she joined has been called an incubator of bebop: trumpeter Dizzy Gillespie and saxophonist Charlie Parker were both in the band, and a recording ban of the period means almost none of this pivotal stretch was ever committed to record.

When Billy Eckstine broke away from Hines in late 1943 to front his own big band, again with Gillespie in the section, he brought Vaughan with him in 1944. She cut her first side that December, and pianist John Malachi hung the nickname "Sassy" on her during this run — it stuck for the rest of her life. She left Eckstine's band by the end of 1944 to go out on her own, freelancing on 52nd Street at the Three Deuces, the Famous Door, and the Onyx Club. It was there, on May 11, 1945, that she recorded "Lover Man" with Gillespie and Parker — a document, rare for the era, of Vaughan singing directly inside the bebop vocabulary the two men were inventing in real time. At Café Society Downtown she met trumpeter George Treadwell, who became her manager, reworked her public image, and married her on September 16, 1946.

Treadwell steered her to Musicraft Records, where her sessions beginning in May 1946 produced "If You Could See Me Now" (arranged by Tadd Dameron), "Don't Blame Me," and "Body and Soul." "Tenderly," cut that year, turned into an unlikely pop hit in late 1947 — she was proud to have been first to record what became a standard. "It's Magic" (December 1947) and "Nature Boy" (April 1948, recorded a cappella because of a second union recording ban) extended the streak. When Musicraft went under, Treadwell moved her to Columbia, where the material tilted toward commercial pop ballads rather than jazz — "Black Coffee" was the big one, in the summer of 1949 — even as critics kept naming her their favorite: Down Beat's poll winner every year from 1947 to 1952, Metronome's from 1948 to 1953. Chicago disc jockey Dave Garroway coined the other nickname that stuck, "The Divine One," during these years.

In 1953, Treadwell negotiated a Mercury Records deal structured to give both sides of her career a home: commercial singles for Mercury proper, jazz-oriented sessions for its subsidiary EmArcy. It is the EmArcy years, working with producer Bob Shad, that jazz history remembers best. The December 1954 session with trumpeter Clifford Brown — released as Sarah Vaughan and later reissued to foreground Brown's name — became, by Vaughan's own account, her favorite record she ever made. At the same time the commercial side kept delivering: "Make Yourself Comfortable" (1954), "Whatever Lola Wants," "The Banana Boat Song," "Misty," and 1959's "Broken Hearted Melody," a song she considered corny but which became her first gold record and a concert staple for the rest of her career. She sang the first Newport Jazz Festival in the summer of 1954 and that fall appeared at Carnegie Hall alongside Count Basie's orchestra, Billie Holiday, Charlie Parker, Lester Young, and the Modern Jazz Quartet.

Her personal life through this stretch and the one that followed was harder than the record sales suggest. She divorced Treadwell in 1958 after discovering that despite a decade of substantial earnings, only $16,000 remained to split. When her Mercury contract lapsed at the end of 1959, she signed with Morris Levy's Roulette Records and, in September 1958, had already married Clyde "C.B." Atkins, a man with no music-industry background whom she made her manager. They adopted a daughter, Deborah — later known professionally as Paris Vaughan — in 1961, but the marriage was, by later accounts, difficult and at times violent; she filed for divorce in November 1963 and discovered Atkins' gambling and spending had left her roughly $150,000 in debt, with the IRS seizing their New Jersey house over unpaid taxes. Clyde "Pumpkin" Golden Jr. helped sort out the wreckage and became her manager for the rest of the decade. Musically, the Roulette years still produced real work — big-ensemble albums arranged by Billy May, Quincy Jones, and Benny Carter among others — and when her contract reverted to Mercury in 1963, she traveled to Denmark that summer with Quincy Jones to record what became one of her most celebrated live albums, Sassy Swings the Tivoli. She played the White House for President Johnson in 1964. But by the back half of the decade her audience and her recorded output were both shrinking, and when her second Mercury contract ended in 1967, she went the rest of the decade without a label.

The comeback arrived in 1971, when producer Bob Shad — her old EmArcy hand, now running Mainstream Records — brought her back into the studio for A Time in My Life, a set built from recent pop material by Bob Dylan, John Lennon, and Marvin Gaye and arranged by Ernie Wilkins. The Mainstream years also gave her, almost by accident, the song that became her signature: Stephen Sondheim's "Send in the Clowns," which she initially resisted (she sued Shad over the 1974 album's cover art) before growing to love it, learning it at the piano with Carl Schroeder's help. In 1974 she performed George Gershwin's music with the Los Angeles Philharmonic at the Hollywood Bowl under conductor Michael Tilson Thomas, a fan who would become a recurring collaborator; the pairing expanded over the following years and eventually produced Gershwin Live! After a rejected Beatles-songbook project sank her Atlantic Records deal, she self-produced I Love Brazil!, drawing on the country's music after a 1977 tour there that she called "the greatest place I think I've ever been on earth."

That record led her, without a label, to Norman Granz's Pablo Records — Granz had managed Ella Fitzgerald and run Verve, and had known Vaughan since 1948 through the Jazz at the Philharmonic tours. The Pablo years, 1977 to 1982, were arguably her most consistent late-career stretch: How Long Has This Been Going On? (1978) with an Oscar Peterson-led quartet of Joe Pass, Ray Brown, and Louis Bellson; the two-volume Duke Ellington Songbook (1979–80); Copacabana (1981), returning to Brazilian material; a second, big-band Send in the Clowns with the Count Basie Orchestra (1981); and Crazy and Mixed Up (1982). In 1982 she also reunited with Tilson Thomas for Gershwin Live!, recorded with the Los Angeles Philharmonic — it won her the Grammy for Best Jazz Vocal Performance, Female, her first competitive Grammy after nine career nominations.

Recording slowed after Pablo folded in 1982, but she kept working: a 1985 Paris concert later released posthumously as In the City of Lights; a 1987 Brazilian collaboration with Sérgio Mendes and Milton Nascimento, Brazilian Romance, her final studio album under her own name; and, in 1989, a scatting cameo alongside Ella Fitzgerald on Quincy Jones' Back on the Block — the only studio recording the two women, whose careers had run in parallel since that November night at the Apollo in 1942, ever made together. That same year she received the NEA Jazz Masters Award and the Grammy Lifetime Achievement Award. Her health failed fast after that: diagnosed with lung cancer during a 1989 run at New York's Blue Note, she was too ill to finish the engagement. She died April 3, 1990, at her home in Hidden Hills, California, at age 66. She is buried at Glendale Cemetery in Bloomfield, New Jersey, following a funeral at Newark's Mount Zion Baptist Church.

What set Vaughan apart, from the bebop-era recordings with Parker and Gillespie onward, was the sheer scale of the instrument itself: a four-octave range running from a rich, near-baritone chest voice up through a soprano register she deployed with operatic control, all of it wrapped in a vibrato critics described as uniquely flexible in size and duration. She didn't just have range — she used it as a compositional tool, bending pitch at the extremes of her register, dropping into sudden low-register asides mid-phrase, and treating melody the way a bebop horn player treats a chord change: as a starting point for improvisation rather than a fixed target. Mel Tormé called her simply "the single best vocal instrument of any singer working in the popular field"; Betty Carter said that with classical training Vaughan could have "gone as far as Leontyne Price"; Frank Sinatra, only half joking, said listening to her made him want to "cut my wrists with a dull razor." Vaughan herself resisted the "jazz singer" label even as critics like Gary Giddins called her voice one that "happens once in a lifetime, perhaps once in several lifetimes" — in a 1982 interview she said, "I can't sing a right-out blues but I can put the blues in whatever I sing," a fair summary of an artist who moved just as comfortably through pop ballads, Brazilian songbooks, and full orchestral programs as she did through straight-ahead jazz. That range of material, more than any single genre label, is the throughline of her catalog — and her direct vocal-line influence runs forward through singers as different as Anita Baker, Dianne Reeves, and Amy Winehouse.