You can synthesize music (singals) several ways. One is the additive method where your sum pure sinusoids to build up a signal (Fourier expansion). Another method is the subtractive method where you create harmonics with square or saw-toothed wave and filter out the parts you do not want. Plot at least 7 non-zero terms of amplitude/phase line spectra of a saw-toothed wave form so that a sound engineer can evaluate which signals are available for manipulation