A ‘Trane Back@sswards - The Cycle of Ascending Major Thirds
Despite its notoriety, "Giant Steps" is but one of 9 known Coltrane originals in which he featured, in whole or in part, the Cycle of Descending Major 3rds, aka "Coltrane Changes ("Countdown", "Satellite" and "26-2" are some of the others).
Originally, 'Trane's intended use of this cycle was as a substitution for the more mundane ii-V7 harmonic movement as well as a device, which in his own words, "...would take me out of the ordinary path".
Since the Cycle of Major 3rds uses three key centers and divides the octave into 3 equal parts, regardless of direction (eg. B-G-Eb / descending or B-Eb-G / ascending), this poses a question: What's the difference in the quality and effect of a descending cycle (Coltrane Changes, aka Giant Steps Changes), as opposed to an ascending one?
To ponder this query, let's take a few giant steps back, so that we might get a more cosmic view of the larger picture. Shall we?