You've almost made it through the major harmonic patterns, congratulations. The 121 pattern is a favorite among many harmonic traders. This is one of the simplest harmonic patterns in structure and after this lesson, you will know exactly how to chart this pattern. Harmonics, is for many traders the most predictable form of non-commercial trading systems with years of history. Some of the top automated trading systems and manual retail traders use harmonics in their trading strategies to make high probability trades. Excited yet? let's dive right into it!