The Table of Keys can be used to find notes of any chord or scale in any key, and to transpose melodies and chords progressions. The table shows the relationship between the major scale (DO RE MI FA SO LA TI DO) and the chromatic scale (which divides the octave into twelve equal half steps) in each of the twelve major keys.

The Universal Key uses a number rather than a letter to name each note in the major scale (DO=1, RE=2, MI=3, etc.). By thinking of the notes of a chord or melody as number, it if easy to find the corresponding notes in any key. The Universal Key is used by musicians as an easy-to-understand system that simplifies communicating and playing all styles of music.