Coltrane’s attitude in writing “Equinox” is described by Dr Lewis Porter as “Coltrane was a serious blues player and his blues pieces reflect the desire to get back to a primal mood, and away from the emotionally lighter, harmonically more complicated and complex blues of the boppers”.

“Equinox” is a minor blues jazz standard by American jazz saxophone player and composer John Coltrane. Originally released on Coltrane’s Sound played in C^# minor with a slow swing feel. However, it is usually played in the key of C Minor and often covered on the flute.