Microtonal music in Boston?

I saw this today in the Avant Music News at
http://www.somnius.com/amn/?p=2235

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Callithumpian Plays in Boston

This ensemble with the hard to pronounce name performs this weekend.

The program includes works by Scelsi, Hyla, Schnittke and Rzewski,
and features flutes and gongs from ancient Egypt, *a microtonal waltz*
and the end of the world as we know it.

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Does anyone know what this is about? The end of the world sounds a
little troubling, but I like the idea of a microtonal waltz...

Prent Rodgers