Abstract: Musical indicating apparatus for finding chords, scales and transposing has a disk-like base with outer rings on both sides having the 12 notes of the chromatic musical scale. An inner rotatable disk on one side identical to the outer ring provides for transposition. On the other side an inner rotatable disk has 12 sectors corresponding to the 12 notes (or scales) of the outer ring. It is subdivided into several rings passing through all the sectors. A root sector has a kind of triad marked for each ring; e.g., major, minor, etc. In the same ring the other notes of the triad are marked. Finally the outer ring includes indicators which show at least 3 notes of a chord to be identified.