VIBRATION

Instrument one is an acoustic guitar. The 8 repetitions progressively add the fundamental, 2nd, 3rd, 4th harmonics, then the 5th and 6th, then the 7th and 8th, then harmonics 10, 11 and 12, and finally the remaining partials.
Note that the pitch of the entire sound is established by the first harmonic and only the timbre changes with the addition of other harmonics.
Also note how the nature of the attack, the pluck, only gets well defined as the higher harmonics are added.
The resonant body of the instrument can be detected right from the start.
  Instrument two is a carillon bell which has both harmonic and inharmonic partials. The lowest component (with the same pitch as the guitar) is called the hum note, and since this instrument has to play melodies, the next harmonic that is added is an octave above the hum note and is called the strike pitch. This produces the overall pitch.
Then various other higher frequencies are added that are harmonically related to the strike note, but which are not always multiples of the hum note, thereby giving the timbre its distinctive and somewhat dissonant metallic quality.