TIL about Wu-Tang Clan's 'Once Upon a Time in Shaolin,' an album so exclusive, only one copy was ever produced.

• There are no circulating copies of the album online and it cannot be commercially exploited until 2103, but it can be played at listening parties.

• It took about six years to record, with features from the entire Wu-Tang Clan, Redman, Cher, and even FC Barcelona soccer players and a Game of Thrones actress.

• The album is unique with only one physical copy in existence, making it the most expensive work of music ever sold.

• The album was bought by Turing Pharmaceuticals CEO, Martin Shkreli, for $2 million, who later lost it when his assets were seized following his conviction for securities fraud.

• In 2021, it was bought by PleasrDAO, a non-fungible token (NFT) collectors' group, for $4 million to cover Shkreli's debts. PleasrDAO hopes to make it more accessible within the confines of 'listening parties'.