Castalia Communications' posters have been putting answers up on the walls for generations of musicians. The Keyboard poster is a beautiful work of educational art which makes visualizing and applying the principles of harmony as easy as do-re-mi. The easy-to-use music theory on the poster applies to piano, organ, synthesizers, and all other keyboard instruments. Poster includes: Four Octave Life-Size Keyboard * Bass & Treble Key Signatures * Table of Keys * Chord & Scale Table * Twelve Major Scales * Bass & Treble Circles of Fifths * and more!