When a song, linked to an emotional memory, becomes impossible to listen to without getting depressed, due to some traumatic events that you associate with the song/memory, such as a breakup or someone dying.
"When he broke my heart, he gave me post-traumatic song depression every time I listen to 'Pale Blue Eyes' by the Velvet Underground."

"Since she died, I've had post-traumatic song depression over every song we listened to together."
by Meowzicats December 17, 2013
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