Jazz musicians who experimented with "colouration, impressionism, counterpoint, and self conscious rhythmic experimentation" --who maintain an interest, broadly speaking, in "the formal properties of jazz"--
"Third Stream" musicians such as Dave Brubeck, Gil Evans, Jimmy Guiffre--a longer list is on 192
to some degree this concern surfaces as an overweening concern white jazz musicians (Miles Davis complains about them in his autobiography)
though Toop notes that Davis, plus "George Russell, Andrew Hill, Chico Hamilton, John Lewis, Ornette Coleman and Eric Dolphy" were exploring areas that were not especially far off from this
"Dolphy, for example, recorded tapes influenced by Indian and Japanese music before his untimely death in 1964; his Out to Lunch album is an enduring example of how eclectic interests can be integrated into music which sounds at once utterly familiar yet from another dimension"