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Up to this point, we've mostly been concerned with scales and compositions based around a particular tonic note.  Even where the key modulates, we have modulated to and from keys with a tonic note - at any point in time, the composition has ''some'' tonal center, although it is not the same note throughout the composition.  Now we will cover scales, and particularly compositions, without a clear tonic note.  This is called '''Atonality'''.