You might be thinking of 'white noise' except that white noise isn't really a random mix of pitches. I believe it is a deliberate mix of a very wide range of pitches. White noise is about as nonmusical as complete silence, but then again silence is not entirely nonmusical. I wouldn't enjoy a steady diet of white noise, but there are some experimental musics that incorporate it as an element.
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The answer is Accidentals.
The cast of Yugodivas - 2001 includes: Juliano Cacia as Sound Recordist
The cast of Debbie Reynolds and the Sound of Children - 1969 includes: Todd Fisher as Cub Scout Carrie Fisher as Girl Scout Debbie Reynolds as herself
Typically, when two or more pitches are sounded together, we identify the sound as "harmony". Depending on the character of this harmony, we can further describe the sound as "consonant" (meaning, "sounding good together"), or "dissonant". Consonant harmonies typically consist of the perfect intervals (unisons, octaves, fourths, and fifths), as well as thirds and sixths (major and minor). Dissonant intervals range from strong dissonances (such as the minor second and major seventh, as well as the augmented fourth), to lesser dissonances such as the minor seventh.
Sound perspective is the way you hear a sound. (Where you hear it coming from)