Microsound includes all sounds on the time scale shorter than musical notes, the sound object time scale, and longer than the sample time scale. Specifically this is shorter than one tenth of a second and longer than 10 milliseconds, including the audio frequency range (20 Hz to 20 kHz) and the infrasonic frequency range (below 20 Hz, rhythm). Physicist Dennis Gabor was an important pioneer in microsound. Micromontage is musical montage with microsound. Microtime is the level of "sonic" or aural "syntax" or the "time-varying distribution of...spectral energy.".