fundamental
fundamental frequency
first harmonic

Every object on a flexible support has a fundamental natural frequency.

Harmonics of this fundamental frequency are used to provide reference points.

The fundamental frequency may simply be unexpected, and unrelated to other sounds in the piece of music.

The pitch of the open string is called the fundamental frequency.

In musical theory, pitch represents the perceived fundamental frequency of a sound.

In music, a scale is any set of musical notes ordered by fundamental frequency or pitch.

The fundamental frequency (F) of the first harmonic could be determined from the mean heart rate per second.

Higher energy states are then similar to harmonics of the fundamental frequency.

They may also have a different fundamental frequency, or other properties.

First of all, there is the basic pitch perceived by the ear - called the fundamental frequency.