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For All We Know in D
Key of D
D major is one of guitar's most resonant keys. The open D string acts as a droning root, and the open A string provides the fifth. This gives D-based strumming a wide, ringing quality that flatpicks and fingerpicks love. D is a beginner-level key on guitar because the open D and A strings provide a powerful bass foundation, and the open high E is the 2nd scale degree adding brightness. Beginners will find this key approachable since most chords use open voicings with minimal stretching.
Voice Leading
The bass line moves through D to E (ascending whole step), E to A (ascending perfect fourth), A to E (descending perfect fourth), E to D (descending whole step), D to B (descending minor third), B to F# (descending perfect fourth), F# to E (descending whole step), E to D (descending whole step), D to F (ascending minor third), F to B (ascending tritone), B to E (ascending perfect fourth), E to D (descending whole step), D to C# (descending half step), C# to G# (descending perfect fourth), G# to C (ascending major third), C to F# (ascending tritone), F# to B (ascending perfect fourth), B to B (ascending unison), B to Cb (ascending half step), Cb to A (descending minor third). 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 D by perfect fourth.
Scales for Improvisation
D 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, D Mixolydian adds the flat seventh for an authentic blues-rock edge.