Piano Chords/Scales Chart Posters. Easily learn and master piano with our helpful Piano chords and scales chart posters. This excellent music theory cheat sheet displays the most essential chords and scales in modern music. This poster is a great learning tool for beginner songwriters, music producers and kids. The piano chord chart displays the major, minor, seventh, augmented and diminished chords in all 12 keys. The piano scales chart displays the major, melodic, natural and harmonic minor scales in all 12 keys.