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Captain Marvel 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 G# (descending perfect fourth), G# to D# (descending perfect fourth), D# to G (ascending major third), G to G (ascending unison), G to E (descending minor third), E to A (ascending perfect fourth), A to A# (ascending half step), A# to D# (ascending perfect fourth), D# to A (ascending tritone), A to D (ascending perfect fourth), D to G (ascending perfect fourth), G to C (ascending perfect fourth), C to G (descending perfect fourth), G to A# (ascending minor third), A# to A (descending half step), A to D# (ascending tritone), D# to E (ascending half step), E to F (ascending half step), F to B (ascending tritone), B to C (ascending half step), C to C# (ascending half step), C# to A# (descending minor third), A# to E (ascending tritone), E to D (descending whole step), D to C (descending whole step), C to D (ascending whole step), D to B (descending minor third), B to D (ascending minor third), D to C# (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 C# to C# 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.