The U.S.-made monitors, known as Zephyr BioHarnesses, will record the miners' vital signs, pulse, heart rhythm and breathing.

CNN: STORY HIGHLIGHTS

The city has a pulse, a rhythm that makes it feel alive, awake somehow if not sentient, then at least organic.

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Mr. Donohue's heart was resuscitated over 45 minutes to get a rhythm and pulse, and then he went into surgery to repair his leg, doctors said.

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Bassist Steve Swallow appears along with the famously dynamic drummer Barry Altschul, whose metric looseness shadows of rhythm that land on and around the pulse draws comparison to the Bley drummer who recorded the tune first, Paul Motian.

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But there is a rhythm to that noise -- a beat, a municipal pulse that resonates in the city's soul.

BBC: This is Buenos Aires week