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I Didn't Know About You 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 E to B (descending perfect fourth), B to A (descending whole step), A to A (ascending unison), A to C# (ascending major third), C# to D (ascending half step), D to F# (ascending major third), F# to G (ascending half step), G to B (ascending major third), B to B (ascending unison), B to E (ascending perfect fourth), E to B (descending perfect fourth), B to C# (ascending whole step), C# to G (ascending tritone), G to E (descending minor third), E to A (ascending perfect fourth), A to C (ascending minor third), C to A (descending minor third), A to E (descending perfect fourth), E to A (ascending perfect fourth), A to A (ascending unison), A to D (ascending perfect fourth), D to D (ascending unison), D to G (ascending perfect fourth), G to D (descending perfect fourth), D to G (ascending perfect fourth), G to D (descending perfect fourth), D to C (descending whole step), C to E (ascending major third), E to B (descending perfect fourth), B to B (ascending unison), B to E (ascending perfect fourth), E to A (ascending 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 A to E 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.