In a 1963 interview with "Jazz" Magazine, Coltrane said he felt indebted to Coleman. While Coltrane's desire to explore the limits of solo improvisation and the possibilities of innovative form and structure was evident in records like "A Love Supreme", his work owed more to the tradition of modal jazz and post-bop. But with the recording of "Ascension" in 1965, Coltrane demonstrated his appreciation for the new wave of free jazz innovators. On "Ascension" Coltrane augmenting his quartet with six horn players, including Archie Shepp and Pharoah Sanders. The composition includes free-form solo improvisation interspersed with sections of collective improvisation reminiscent of Coleman's "Free Jazz". The piece sees Coltrane exploring the timbral possibilities of his instrument, using over-blowing to achieve multiphonic tones. Coltrane continued to explore the avant-garde in his following compositions, including such albums as "Om", "Kulu Se Mama", and "Meditations", as well as collaborating with John Tchicai.