what is the relationship between a fundamental note and its overtones ?
There is definitely a relation between the fundamental note and its overtones. Firstly we have to understand the fundamental note and then the overtones. It should be remembered that 1st harmonic is not at all an overtone. So the first harmonic is considered the fundamental note. The 2nd, 3rd, 4th, 5th and 6th harmonics are actually the overtones. The 2nd harmonic is considered the first overtone and it goes up to the 6th harmonics which is considered the 5th overtone.