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One Note Samba in A
One Note Samba in A: Jobim's bossa nova gem oscillates between two adjacent chords with characteristic Lydian Dominant flavor. Dorian fits the minor moments while Major Pentatonic keeps the melodic lines light and playful. Chords: C#m7 – C7 – Bm7 – A#7#11 – Em7 – A7 – Dmaj7 – G7 – A6 – Dm7 – Cmaj7 – Cm7 – F7 – A#maj7 – Bm7b5 – E7 – C6 – B7.
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 C# to C (descending half step), C to B (descending half step), B to A# (descending half step), A# to E (ascending tritone), E to A (ascending perfect fourth), A to D (ascending perfect fourth), D to G (ascending perfect fourth), G to A (ascending whole step), A to D (ascending perfect fourth), D to C (descending whole step), C to C (ascending unison), C to F (ascending perfect fourth), F to A# (ascending perfect fourth), A# to B (ascending half step), B to E (ascending perfect fourth), E to C (descending major third), C to B (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 B to C# by whole step.
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.