Pitch (Frequency): heard in Octaves
			Sound “Do” in musical scales:                                       C1. 32.703  Hz.                                       C2. 65.406.                                       C3. 130.81.                                       C4. 261.63.  (middle C)                                       C5. 523.25.                                       C6. 1046.5.                                       C7. 2093.