For my physics lab report, we are supposed to conduct an experiment to show the non-harmonic oscillation of a simple pendulum. I know what is simple harmonic oscillation, damped oscillation, driven damped oscillation. But what is a non-harmonic oscillation? A google search reveals that there are also other forms of oscillation such as anharmonic oscillation and non-linear oscillation. Care to explain what are they and the differences. Any idea what experiment I should conduct.