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→Subcategories of Sound: Wrote a sentence and included a reference.
== Subcategories of Sound ==
== Subcategories of Sound ==
Types of sound include speech, music, noise; dissonant, harmonic, masking (such as low tones making high more difficult to hear); underwater sound, and so forth.<ref>Phillips, R., and others. ''Sound.'' 1971. Funk & Wagnalls New Encyclopedia, Volume 24.</ref>
==References==
==References==
<references />
<references />
[[Category:physics]]
[[Category:physics]]