Sweet Diminished unfolds over the A major progression Amaj7, Fdim7, F#m7, C#m7, and Dmaj7. The Fdim7 chord creates an unexpected bridge between Amaj7 and F#m7, and a diminished arpeggio line brings that harmonic turn into focus. The remaining phrases draw primarily from the major pentatonic scale, balancing the altered tension with smooth, melodic movement and a clear sense of resolution.