Dolly Parton left behind one extraordinary musical mystery: a secret recording that fans must wait decades to hear.

The unreleased song is reportedly titled “My Place in History.” Dolly wrote and recorded it before sealing it inside a special wooden time capsule at Dollywood’s DreamMore Resort.

According to her instructions, the recording must remain locked away until 2046—the year Dolly would have celebrated her 100th birthday.

The time capsule reportedly contains the song on multiple formats, along with equipment intended to help future generations play it. Very few details about the recording have ever been revealed, and Dolly was believed to be the only person who knew its complete melody and lyrics.

Dolly later admitted that keeping the song hidden was more difficult than she expected. She even joked that she wanted to retrieve it because she believed it was a genuinely good song.

The mysterious recording is only one part of the enormous musical legacy Dolly carefully planned. She also reportedly left behind unreleased material that could allow her voice and songwriting to reach new generations for years to come.

Fans will have to wait until 2046 to discover exactly what message Dolly placed inside “My Place in History.”

Until then, the secret song remains locked away—waiting for the day the world is finally allowed to hear it.