Footage of the woman singing was captured on the Purple Line's Normandie/Wilshire Metro stop Tuesday evening.
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The social media post from LAPD says, "4 million people call LA home. 4 million stories. 4 million voices...sometimes you just have to stop and listen to one, to hear something beautiful."
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An officer with the Metro Transit Authority heard the woman singing and stopped to capture the moment on his phone.
The woman has not yet been identified.