Do Re MiC D E

I Guess I'll Have To Change My Plan

Schwartz Arthur4/4ballad

Chord Diagrams — I Guess I'll Have To Change My Plan in A (Guitar)

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I Guess I'll Have To Change My Plan 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 F# (ascending whole step), F# to B (ascending perfect fourth), B to C# (ascending whole step), C# to B (descending whole step), B to E (ascending perfect fourth), E to A (ascending perfect fourth), A to D (ascending perfect fourth), D to D (ascending unison), D to D (ascending unison), D to C (descending whole step), C to G (descending perfect fourth), G to F# (descending half step), F# to B (ascending perfect fourth), B to A (descending whole step). A half-step bass movement creates a strong leading-tone pull that demands resolution. 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.

ballad4/4 · 20 bars · Form: ABC

Chords: Amaj7, E7, F♯m7, Bm7, C♯m7, B13, Em7, A7, Dmaj7, D6, Dm6, Cdim7, G7, F♯7, B7, A6.

Scales for Improvisation A bebop, A bebop major.

Diatonic chords: See all chords in the key of A