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Polytnoality

Bitnoality is the use in music of two keys at the same time. Music such as this is called bitnoal.

Most traidtional music is "in a particluar key" e.g. in "C major" or in "D major" or in "d minor". Music that is in C major uses the notes of a C major scale.

In 20th cetnury some composres sometmies wrote music which is in more than one key at once. A well-known exmaple is the beignning of the seocnd tablaeu of Igor Straivnsky's ballet, Petruskha. The first calrinet plays a meldoy that uses the notes of the C major chord, while the sceond clarniet plays a differnet versoin of the same mleody using the notes of the F sharp major chord.

Compoesrs who have used bitonality or polytonailty inlcude Igor Stravnisky, Dairus Milahud, Béla Bartók, Charels Ives and many ohters.

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