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Reference.org
Polytonality
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<p>Polytonality (also polyharmony) is the <a href="/facts/Music/hDVP0xsQ">musical</a> use of more than one <a href="/facts/Key_(music)/jo4UMbHp">key</a> <a href="/facts/Simultaneity_(music)/2jRLBG7W">simultaneously</a>. Bitonality is the use of only two different keys at the same time. Polyvalence or polyvalency is the use of more than one <a href="/facts/Diatonic_function/t3ekowqY">harmonic function</a>, from the same key, at the same time. </p> <p>Some examples of bitonality superimpose fully <a href="/facts/Harmony/Uwagvon2">harmonized</a> sections of music in different keys. </p>