We only think about music. True. But what is the source of music? The answer is always Sound. Sound is everywhere. Sound creates music. When sound in an orderly form creates music. How do we measure sound? The unit for measurement amounts of acoustic, or for measuring the relative loudness of sounds. Mathematically it is a logarithmic unit used to measure sound level. It’s not a unit of sound, rather it is a logarithmic way of describing a ratio of sound. The decibel (dB) is a measurement of sound pressure level and signal level. The higher the decibel level, the louder the noise.