The Lydian Chromatic Concept was the first codified original theory to come from jazz. Musicians who assimilated Russell's ideas expanded their harmonic language beyond that of bebop, into the realm of post-bop. Russell's ideas influenced the development of modal jazz, notably in the album "Jazz Workshop" (1957, with Bill Evans and featuring the "Concerto for Billy the Kid") as well as his writings. Miles Davis also pushed into modal playing with the composition "Miles" on his 1957 album "Milestones". Davis and Evans later collaborated on the 1959 album "Kind of Blue", which featured modal composition and playing. John Coltrane explored modal playing for several years after playing on "Kind of Blue."