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One By One in A
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 B (descending half step), B to E (ascending perfect fourth), E to A (ascending perfect fourth), A to G (descending whole step), G to C (ascending perfect fourth), C to D (ascending whole step), D to F (ascending minor third), F to G (ascending whole step), G to B (ascending major third), B to A# (descending half step), A# to C (ascending whole step), C to F# (ascending tritone), F# to F# (ascending unison), F# to E (descending whole step), E to C# (descending minor third), C# to B (descending whole step). A half-step bass movement creates a strong leading-tone pull that demands resolution. The predominantly stepwise bass motion creates smooth, connected voice leading. When the progression loops, the bass returns from B to C by half 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.