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Why do the sounds of two musical instruments always reinforce, and never cancel out?

April 26, 2017cancel instruments musical reinforce Sounds

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Why do the sounds of two musical instruments always reinforce, and never cancel out?

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According to the interference of waves, two waves with exactly the same amplitude and frequency can either reinforce (if they are in phase) or cancel (if 180 out of phase). However, when two instruments play the same note, it is always louder, and never softer. Why?