New Yorkers passing through the subways starting Wednesday may notice something unfamiliar in the air: a voice that isn’t telling them when the next train arrives, but is instead nudging them to feel something.

A new audio artwork by conceptual artist and lifelong New Yorker Chloë Bass — titled “if you hear something, free something” — will take over the public address systems in 14 subway stations citywide, including Grand Central, Union Square, Atlantic–Barclays and Court Square.

The project represents the first time the MTA has opened its broadcast infrastructure to an artist-led commission. This one is a collaboration between the nonprofit public arts organization Creative Time and MTA Arts & Design , the agency's in-house arts agency.

Bass said the work, which is made up of 24 po

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