<P> Polytonality ( also polyharmony ( Cole and Schwartz 2012 ) ) is the musical use of more than one key simultaneously . Bitonality is the use of only two different keys at the same time . Polyvalence is the use of more than one harmonic function , from the same key , at the same time ( Leeuw 2005 , 87 ) . </P>
<P> Polytonality ( also polyharmony ( Cole and Schwartz 2012 ) ) is the musical use of more than one key simultaneously . Bitonality is the use of only two different keys at the same time . Polyvalence is the use of more than one harmonic function , from the same key , at the same time ( Leeuw 2005 , 87 ) . </P>
the technique of using two or more tonal centers at the same time is called
the technique of using two or more tonal centers at the same time is called
Polyvalence
Polyvalence