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Windows in A
Chick Corea's post-bop composition layers Lydian Dominant tension and Bebop Major clarity over a fluid A architecture. Dorian inflections soften the dominant color and give improvisers multiple entry points for expressive phrase building. Study the Am7 – F#m7b5 – B7 – Em7 – C7sus4 – Dmaj7#11 – F#7 – G7 – Dmaj7 – Dmaj7/D# – Bm7 – Bm7/B – G#m7b5 – G#m7b5/Ab – C#7/G – C#7 – F#m7 – F#m7/Gb – B7/F – C#m7 – A#7#11 – Amaj7 changes to develop sophisticated vocabulary for post-bop major/dominant modal interplay.
Key of A
A major is a rock and blues cornerstone. The open A string delivers a strong root, while both E strings ring as the fifth. Classic A-D-E progressions practically play themselves with open cowboy chords. The open high E is the fifth, reinforcing power. A is a beginner-level key on guitar because the open A string is the root and the open E strings provide the fifth above and below, creating a massive low-end anchor. Beginners will find this key approachable since most chords use open voicings with minimal stretching.
Voice Leading
The bass line moves through A to F# (descending minor third), F# to B (ascending perfect fourth), B to E (ascending perfect fourth), E to C (descending major third), C to D (ascending whole step), D to F# (ascending major third), F# to G (ascending half step), G to D (descending perfect fourth), D to D (ascending unison), D to B (descending minor third), B to B (ascending unison), B to G# (descending minor third), G# to G# (ascending unison), G# to C# (ascending perfect fourth), C# to C# (ascending unison), C# to F# (ascending perfect fourth), F# to F# (ascending unison), F# to B (ascending perfect fourth), B to C# (ascending whole step), C# to A# (descending minor third), A# to A (descending half step). A half-step bass movement creates a strong leading-tone pull that demands resolution. The root motion by larger intervals (fourths and fifths) gives each chord change a strong, decisive character. When the progression loops, the bass returns from A to A by unison.
Scales for Improvisation
A 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, A Mixolydian adds the flat seventh for an authentic blues-rock edge.