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The piano had three manuals, and strings tuned a quarter tone apart.

Since then her compositions have been notated in quarter tones.

More subtle changes of a quarter tone or less can be made with some models.

The piece makes extensive use of quarter tones and golden mean sections.

However, this scale is commonly represented with the first and last half step each being represented as a quarter tone.

Her ability to remain a quarter tone above or below the written note was truly inspired.

The name derives from the interval being the 7-limit approximation of a quarter tone.

But the music was ornamented with sharp, insistent quarter tones.

Its size is 48.8 cents, making it practically a quarter tone.

In this scale the quarter tone is the smallest step.