"John Coltrane began using LSD fairly regularly some time in 1965. Although it has been stated by some that he took it only when he recorded OM later that year, he actually took it far more often during the last few years of his life, according to a number of people, including a member of his quartet who would prefer, like others, not to be quoted directly on this subject."
- Coltrane biographer Eric Nisenson
John Coltrane - Ascension (1966; Impulse! Records)
