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Desafinado in A
A Desafinado: the song that launched bossa nova internationally, packed with sophisticated chromatic passing chords. Lydian Dominant is the key scale over the altered dominants that give the tune its distinctive harmonic edge. Changes: Amaj7 – B7#11 – Bm7 – E7 – C#m7b5 – F#7b9 – C#7b9 – F#7 – B7b9 – A#maj7 – Dm6 – G#7#9 – C#maj7 – Ddim7 – D#m7 – G#7 – A#m7 – Emaj7 – Fdim7 – F#m7 – B7 – Gm6 – E7b9 – G7 – A6.
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 B (ascending whole step), B to B (ascending unison), B to E (ascending perfect fourth), E to C# (descending minor third), C# to F# (ascending perfect fourth), F# to C# (descending perfect fourth), C# to F# (ascending perfect fourth), F# to B (ascending perfect fourth), B to A# (descending half step), A# to D (ascending major third), D to G# (ascending tritone), G# to C# (ascending perfect fourth), C# to D (ascending half step), D to D# (ascending half step), D# to G# (ascending perfect fourth), G# to A# (ascending whole step), A# to E (ascending tritone), E to F (ascending half step), F to F# (ascending half step), F# to B (ascending perfect fourth), B to G (descending major third), G to E (descending minor third), E to G (ascending minor third), G to A (ascending whole 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 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.