Cassettes featuring the unreleased songs are expected to sell for hundreds of thousands, even though it won't give the buyer the master rights.

Michael Jackson's estate is fighting to block an auction of unreleased songs, claiming ownership of the tapes and their copyright.

Michael Jackson's estate is fighting to block an auction house from selling the singer's unreleased music. According to Complex, sourcing intel first reported on by TMZ, the auction house Gotta Have Rock and Roll is auctioning off two unreleased cassette tapes containing 12 previously unheard tracks from the late pop star.

In a bold move to protect Michael Jackson's musical legacy, representatives of the late artist's estate have spoken out against an upcoming auction.