So What by Miles Davis has chord changes that use the dorian minor scale and can be classified as modal music. Having only two different chords makes it easier to make pitch choices. Having only two different chords makes it more difficult to create harmonic and melodic interest since the tonal flavor of the tune is static.
 
The original version of So What was recorded by the Miles Davis sextet on the all-time best-selling jazz album Kind of Blue. The tempo is moderate, and Miles’ solo is one the best-known solos in the history of jazz. The melody on the original recording is played by bassist Paul Chambers. Bill Evans the who plays piano on this version played unique chord voicings based on intervals of the fourth.

John Coltrane recorded the tune Impressions with the same chord changes as So What in 1961. It was released in 1963 on the album Impressions and is also a jazz classic played by many jazz musicians. The melody of Impressions sounds similar to Morton Gould’s 1939 American Symphonette #2 Pavanne. Both So What, and Impressions are monumental recordings that have stood the test of time.
 
Famous Recordings that have the chord changes of Impressions and So What include:
George Benson – Beyond the Blue Horizon (1971)
John Coltrane – Live at the Village Vanguard (1961)
Miles Davis – Kind of Blue (1959)
Miles Davis – Miles Davis at Carnegie Hall (1963)
Miles Davis – Live at the Plugged Nickel (1965)
Eddie Jefferson – Body and Soul (1968)
Wes Montgomery – Live at the Half Note (1965)
George Russell – So What (1983)
Jeremy Steig – Flute Fever (1963)
McCoy Tyner – Infinity (1995)