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A steady-state wave is a mode of vibration where amplitude varies, with points of zero amplitude and points of maximum amplitude. In physics, particularly in the study of sound, a steady-state wave can be analyzed using Fourier analysis. The Fourier theorem states that such a wave is composed of a fundamental frequency and its harmonics, each with a specific amplitude and phase. This composition forms the wave's spectrum. Musical instruments generate steady-state tones through variations in air pressure, which set up standing waves. The amplitudes of these spectral components contribute to the instrument's unique tone quality, or timbre.123

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