Interplay, Prestige Records' new 5-CD set, containing early collaborative recordings of the peerless tenor saxophonist and visionary John Coltrane, serves two distinct purposes. The first is to offer an extraordinary collection of music that provides an excellent overview of the modern jazz scene during the fertile 1956-1958 period. The other - and arguably more important purpose to the legions of Coltrane faithful - is its rich delineation of the evolutionary process behind one of the most profoundly important and emotionally compelling artists this planet has ever seen.