How to Write Triad Chord Symbols

In this lesson we learn how to write the chord names introduced earlier in our chord-theory series. Until now we have mostly spelled them out as major, minor, diminished, and augmented. On a lead sheet, musicians use concise chord symbols instead.

Let's review the triads in the order we learned them. Links to the individual lessons are available below.

A C major triad is simply written C. The word 'major' is normally omitted from the symbol for a major triad.

A C minor triad is written Cm. The lowercase m means minor. Take care not to confuse it with uppercase M, which is sometimes used for a major seventh chord.

A C diminished triad can be written Cdim or C° (a small circle). You may also encounter Cm(♭5): the notes are C–E♭–G♭ in each case, though Cdim and C° are the clearest common triad symbols.

A C augmented triad can be written Caug or C(♯5), and often also C+. Its notes are C–E–G♯. The sharp sign refers to the fifth of the chord, not the root.

Chord symbols are a practical shorthand. Learn both the chord tones and the common written forms so you can read lead sheets quickly and communicate easily at rehearsals and sessions.