MF DOOM released his debut solo album Operation Doomsday October 19, 1999

Operation: Doomsday is the debut solo studio album by rapper MF DOOM, marking his return to the hip-hop scene after the demise of his group KMD. The album was released through Fondle ‘Em Records on 19 October 1999 and reissued by Sub Verse Records in 2001 with a slightly altered track listing. Operation: Doomsday is regarded as one of the most influential albums in independent hip-hop history. A deluxe remastered version of the album was released by Doom’s own Metal Face Records on 24 October 2011.

Operation: Doomsday was produced by Daniel Dumile himself and recorded under his new name MF Doom, also known as Metal Face Doom. The recording draws most of its character from lo-fi production values, retaining minor flaws and imperfections. MF Doom self-produced his solo album through the use of low-fidelity bedroom production in addition to low-budget audio mixing techniques. His eccentric record production maintains a left-field finish, often invoking a mid-1980s quiet storm. He incorporated a variety of musical styles onto the album, featuring an at times abstract mixture of 1980s soul and smooth jazz loops with vintage drum breaks. Doom’s usage of smooth jazz loops served to alleviate muffled recording sounds while integrating cartoon samples and snippets. For the most part, MF Doom included minimal percussion to complement his musical selections, often rapping over their original musical backdrops.
…[source: https://en.wikipedia.org/wiki/Operation:_Doomsday]