In 1964, Martin Luther King delivered a speech at the New School for Social Research titled "The Summer of our Discontent." Somewhere down the line, the tape got misplaced. As in, nobody knew where it was. When New School researchers started looking for it in earnest a few years ago, all they found was a 15-minute recording of the question-and-answer session that took place after the speech. Last October, an Amherst archivist made a surprising discovery while she was sorting through boxes. 

The Boston Globe reports:

"The boxes of old reel-to-reel audio tapes from the 1950s, ’60s, and ’70s had been given to Amherst archivists in 1989, but it wasn’t until October that archivist Mariah Leavitt came across the recording as part of an effort to pull together all of the school’s material on the station, now known as WAMH...The result is a clear recording of King’s deliberate delivery of “The Summer of Our Discontent,” in which he offers reasons for civil rights activism during the summer of 1963."

Want to know more? Make sure to read the full story over at The Boston Globe.