Black Orheus in A

L. Bonfa()bossa-nova
Do Re MiC D E
A
B

Chord Diagrams — Black Orheus in A (Guitar)

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

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.

bossa-nova2/2 · 39 bars · Form: AB

Chords: Am, E7♭9, Bm7♭5, Am9, E7, G7, Dm7, CMaj7, A7♭9, Em7♭5, FMaj7, Dm, Dm9, DmMaj7, Am7/G, F7, F♯m7♭5, Bm7/E, Am7, Em7.

Scales for Improvisation A bebop minor, A bebop.

Diatonic chords: See all chords in the key of A