The above plot shows the plots of what a major chord(in blue) and a minor chord(in black) look like. Superimposed on one another, they overlap at the sequence of (1+2n)π/11. that is to say that it composes a sequence of the following form:
This is not readily apparent from the graph above, but can be seen from the HTML embedded link below.
If you were to plot the waves as one, you would see that the function zero's out at 4 different points per cycle of 2π. This is the mathematical cause for dissonance when a Major Chord and a Minor Chord are played together. Manipulating these minor differences is a very common technique in modern music.
