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Afro Blue in B
Afro Blue in B — Mongo Santamaria's Afro-Cuban gem in 6/8, transformed into a modal jazz statement by Coltrane. Dorian defines the rocking minor vamp; Harmonic Minor and Minor Pentatonic add blues depth. Changes: Bm7 – G7#9/D – F#7#9/C# – A – G.
Key of B
B major mixes barre and open elements. The B chord itself is a barre at fret 2, but E and A are comfortable open chords forming the IV and V. The open B string rings as the root, allowing creative drone-based arrangements. B is a intermediate-level key on guitar because the open B string rings as the root and the open E strings provide the 4th — useful for sus4 voicings and drone effects. This key mixes open and barre shapes, making it a good intermediate challenge that builds fretboard fluency.
Voice Leading
The bass line moves through B to G (descending major third), G to F# (descending half step), F# to A (ascending minor third), A to G (descending whole step). A half-step bass movement creates a strong leading-tone pull that demands resolution. The mix of stepwise and leap motion balances smoothness with harmonic drive. When the progression loops, the bass returns from G to B by major third.
Scales for Improvisation
B major pentatonic works because every note is either a chord tone or a safe passing tone — there are no avoid notes. For soloing, this means you can play freely without clashing. Over dominant seventh chords, B Mixolydian adds the flat seventh for an authentic blues-rock edge.