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Invitation in A
Invitation in A: Bronisław Kaper's mysterious minor standard carries an unsettling harmonic pull. Dorian governs the stable stretches while Lydian Dominant and Altered scales navigate the chromatic dominant motion. Chords: Am7 – D7 – G7 – Cm7 – F7 – A#7#11 – A#m7 – D#7 – D#7alt – G#m7 – C#7 – C#7alt – F#m7 – B7 – B7alt – Em7 – C7#11 – B7b9 – E7alt – G#7#11 – Dm7b5 – G7#9 – CmMaj7.
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 D (ascending perfect fourth), D to G (ascending perfect fourth), G to C (ascending perfect fourth), C to F (ascending perfect fourth), F to A# (ascending perfect fourth), A# to A# (ascending unison), A# to D# (ascending perfect fourth), D# to D# (ascending unison), D# to G# (ascending perfect fourth), G# to C# (ascending perfect fourth), C# to C# (ascending unison), C# to F# (ascending perfect fourth), F# to B (ascending perfect fourth), B to B (ascending unison), B to E (ascending perfect fourth), E to C (descending major third), C to B (descending half step), B to E (ascending perfect fourth), E to G# (ascending major third), G# to D (ascending tritone), D to G (ascending perfect fourth), G to C (ascending perfect fourth). 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 C to A by minor third.
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.