Prince, The Black Album
The legendary Black Album is Prince's sixteenth studio album and was released in 1994 with Warner Bros. Records. The original release plan was to have the album follow Sign of the Times in an all-black sleeve with no title or credit to Prince. The album is a direct callout to criticism about Prince becoming too much of a pop-artist, and this was his attempt to regain his former audience. The record sold once for $27,000.
The Sex Pistols, God Save the Queen
This single by the Sex Pistols was featured on their only studio album, Never Mind the Bollocks, Here's the Sex Pistols. The single version was released during Queen Elizabeth II's Silver Jubilee in 1977. The lyrical content was considered highly controversial, just as the band intended; BBC refused to air it. You can sell it today for $16,000.