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Guarde Nos Olhos 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 A to E (descending perfect fourth), E to A (ascending perfect fourth), A to A (ascending unison), A to A (ascending unison), A to F# (descending minor third), F# to F# (ascending unison), F# to D (descending major third), D to D (ascending unison), D to D (ascending unison), D to E (ascending whole step), E to E (ascending unison), E to E (ascending unison), E to C# (descending minor third), C# to F# (ascending perfect fourth), F# to C# (descending perfect fourth), C# to A# (descending minor third), A# to D# (ascending perfect fourth), D# to C# (descending whole step), C# to B (descending whole step), B to B (ascending unison), B to E (ascending perfect fourth), E to E (ascending unison), E to A (ascending perfect fourth). The predominantly stepwise bass motion creates smooth, connected voice leading. 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.