It happened on Tuesday at the 14th Street - Union Square subway station in Manhattan.
A video taken by an Instagram user captured Natalia Paruz, known as 'Saw Lady' performing when a man suddenly walks up and takes the money from her tip bucket.
Paruz tries to fight him off with the baton from her instrument but the man makes a run for it.
On Instagram, Paruz wrote, "It's enough for this to happen once, for one to start thinking that everyone stopping to listen to you might steal from you. It zaps one's energy and enthusiasm."
So far, the robber remains on the run.
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