Aphex Twin AKA Caustic Window, Caustic Window
To record the eponymous song, Aphex Twin used the term Caustic Window. However, after producing just 5 copies, he decided to leave it. It was a positive thing that they got out of one of them, regardless. In 2017, the record was viewed on Discogs. There was a starting price of 13,500 dollars! In the end, for $46,300, the record was acquired by none other than Markus Persson, the maker of Minecraft.

Aphex Twin AKA Caustic Window, Caustic Window
The Beatles, The Beatles (AKA “The White Album”) (1968)
The song in question is the very first press release of the Beatles’ 9th album. This exact copy has “A0000001” as its serial number. For years, there have been reports that John Lennon has a copy of it. The truth, however, was that Ringo Starr had it! For 35 years, the duplicate remained locked in a bank vault and was sold off at a charity sale for a record $790,000. If you are good enough to buy a low serial number duplicate, you could be in for $13,750.

The Beatles, The Beatles (AKA “The White Album”) (1968)