bIII7 roman degree
An applied dominant tonicising bVI — the other Coltrane major-thirds cell, a key centre a major third below the tonic.
Where it lives
3semitones from the tonic
Major mode
dominant 7th
Hear it in context: Coltrane 'Giant Steps' Cell
Piano sound loads on first tap. Resolved in the key of C — every chord links to its full analysis.