Volunteers tidying up the 4,418-foot (1,347-meter) Ben Nevis last weekend were puzzled to find the piano buried under a pile of rocks on the summit plateau.
The John Muir Trust, which owns part of the Scottish mountain, appealed for information about how it got there and said Friday that it appeared that a 24-strong team of removal men were responsible.
"We attached poles at the front and back with four men on each pole. We took it in turns to carry the piano," Mike Clark, a retiree from Dundee, said in a statement released by the trust. "It was a lot harder than we thought it would be but we kept going."
Clark said the group had tried to break it up to make it easier to carry down, but failed and decided to bury it under a conical pile of stones called a cairn. They took the keyboard, with each receiving a key as a souvenir.
Clark said one of the team, which was raising money for a cystic fibrosis charity, slipped and broke a leg on the way down and had to be rescued by a military helicopter, the AP reports.
The trust was clearing trash from the mountain, which attracts an estimated 120,000 people a year, many of them on fundraising outings.
The troops of the Southern and Western military districts will begin to return from Russia's southern borders to the points of their permanent deployment starting April 23