2–5–1 Chord Progression Keyboard Infographic with Circle of Key Signatures

Music theory infographic titled "2–5–1 Chord Progression". Archetype: KEYBOARD INTERVAL DIAGRAM. Editorial music education poster in retro 1970s vinyl style, minimal monochrome palette, clean high-contrast black, cream, and muted gray, subtle paper texture, geometric layout. Render a precise piano keyboard as the central diagram, with musically accurate highlighted keys and interval relationships showing a ii–V–I progression in clear theory form. Include three grouped keyboard sections or one continuous keyboard with segmented overlays for ii, V, and I chords, with exact note spellings and chord symbols in canonical form such as Dm7 – G7 – Cmaj7 as the primary example. Show chord tones on the keyboard with distinct markers, stacked interval callouts from root to 3rd, 5th, and 7th, directional arrows indicating progression flow ii → V → I, and optional small secondary examples in other keys arranged around the main keyboard for general theory context. Emphasize functional harmony, voice leading between 7th chords, common tones, and semitone resolutions with precise visual connectors between neighboring chord tones. Incorporate subtle circular compositional motifs inspired by the concept of a circle of key signatures, but do not render an actual circle of fifths and do not include that phrase as on-image text. No copyrighted song lyrics or full sheet music. Include concise educational labels in English for functions, intervals, resolutions, and chord roles; note names and chord symbols remain canonical international form. Musically accurate notation, interval spacing, and keyboard geometry. All text MUST be written in English (array). Every heading, label, caption, legend and metric name in the image must be in English — not English. Spell each English word correctly using English characters and diacritics. Numbers stay as digits, no watermarks Musically accurate notation, finger positions and intervals. Note names and Italian musical terms stay in canonical international form. No copyrighted song lyrics or sheet music.