"So What" is the iconic opening track of Miles Davis's 1959 album Kind of Blue, the best-selling jazz album of all time and a watershed moment in the history of improvised music. Built on a deceptively simple modal framework in D minor with a half-step shift to E-flat minor for the bridge, the composition liberated improvisers from the dense chord progressions of bebop, inviting them instead to explore melodic possibilities within a more open harmonic landscape. Davis's two-chorus trumpet solo establishes the tone with his characteristically understated lyricism, using space and silence as expressively as the notes themselves. John Coltrane follows with two choruses of tenor saxophone that hint at the harmonic explorations he would soon pursue in his own work, his sheets of sound approach already becoming evident. Julian "Cannonball" Adderley closes the solo sequence with two alto saxophone choruses that bring a soulful, bluesy warmth, his ebullient style providing a counterpoint to the more introspective approaches of Davis and Coltrane. The rhythm section of Bill Evans on piano, Paul Chambers on bass, and Jimmy Cobb on drums provides a buoyant, almost floating accompaniment that perfectly supports the modal concept. "So What" has become one of the most recognizable pieces in all of jazz, its call-and-response bass line and two-chord structure serving as a gateway into jazz for countless listeners and musicians.
