William John Evans (August 16, 1929 – September 15, 1980) was an American jazz pianist and composer who mostly played in trios. His use of impressionist harmony, inventive interpretation of traditional jazz repertoire, block chords, and trademark rhythmically independent, “singing” melodic lines continue to influence jazz pianists today.

Born in Plainfield, New Jersey, in 1929, he was classically trained at Southeastern Louisiana University and the Mannes School of Music, where he majored in composition and received the Artist Diploma. In 1955, he moved to New York City, where he worked with bandleader and theorist George Russell. In 1958, Evans joined Miles Davis‘s sextet, which in 1959, then immersed in modal jazz, recorded Kind of Blue, the best-selling jazz album of all time. During that time, Evans was also playing with Chet Baker for the album Chet.

In late 1959, Evans left the Miles Davis band and began his career as a leader, with bassist Scott LaFaro and drummer Paul Motian, a group now regarded as a seminal modern jazz trio. In 1961, ten days after finishing an engagement at the New York Village Vanguard jazz club, LaFaro died in a car accident. After months of seclusion, Evans reemerged with a new trio, featuring bassist Chuck Israels.

In 1963, Evans recorded Conversations with Myself, a solo album using the unconventional technique of overdubbing himself. In 1966, he met bassist Eddie Gómez, with whom he worked for 11 years.

Many of Evans’s compositions, such as “Waltz for Debby“, have become standards, played and recorded by many artists. Evans received 31 Grammynominations and seven awards, and was inducted into the Down Beat Jazz Hall of Fame.

Evans grew up in North Plainfield, New Jersey, the son of Harry and Mary Evans (née Soroka). His father was of Welsh descent and ran a golf course; his mother was of Carpatho-Rusyn ancestry and descended from a family of coal miners. The marriage was stormy owing to his father’s heavy drinking, gambling, and abuse. He had a brother, Harry (Harold), two years his senior, to whom he was very close.

Given Harry Evans Sr.’s destructive character, Mary Evans often left home with her sons to go to nearby Somerville, to stay with her sister Justine and the Epps family. There, Harry began piano lessons somewhere between age 5 and 7 with local teacher Helen Leland. Bill was thought to be too young for lessons, but he began to play what he had heard during his brother’s,  and soon both were taking piano lessons. Evans remembered Leland with affection for not insisting on a heavy technical approach, with scales and arpeggios. He quickly developed a fluent sight-reading ability, but Leland considered Harry a better pianist.

Bill Evans is seen as the main reformer of the harmonic language of jazz piano. Evans’s harmonic language was influenced by impressionist composers such as Claude Debussy and Maurice Ravel. His versions of jazz standards, as well as his own compositions, often featured thorough reharmonisations. Musical features included added tone chords, modal inflections, unconventional substitutions, and modulations.

One of Evans’s distinctive harmonic traits is excluding the root in his chords, leaving this work to the bassist, played on another beat of the measure, or just left implied. “If I am going to be sitting here playing roots, fifths and full voicings, the bass is relegated to a time machine.” This idea had already been explored by Ahmad Jamal, Erroll Garner, and Red Garland. In Evans’s system, the chord is expressed as a quality identity and a color.