Blackland Radio 66.6 (stylized as Blvcklvnd Rvdix 66.6 (1991) in all caps) is the fourth mixtape by American rapper SpaceGhostPurrp. It was self-released on May 1, 2011, and re-released in February 2017, by Yeah We On Entertainment. The majority of the mixtape is self-produced, and features guest production and vocals from Lil Ugly Mane, Main Attrakionz, Supa Sortahuman, and J.K. the Reaper. The artwork was created by Lil Ugly Mane and Chino Amobi.
The mixtape pays homage to the hip hop scene of the 1990s, especially Three 6 Mafia's early material, whose influence is evident in tracks such as "Underground" and "Pheel tha Phonk 1990" and on its cover, which was based on the classic Memphis Pen & Pixel style of covers. It features chopped and screwed vocals in some tracks. Media samples from films and games like Mortal Kombat 3 and Godzilla are also included, which was unique to the genre. Themes on this mixtape stem from sex to drug abuse, and while doing so, over lo-fi, trap instrumentals. SpaceGhostPurrp uses southern slang throughout the whole album while using extremely vulgar lyrics.
Brandon Soderberg of Pitchfork gave the mixtape a 7.1 out of 10 rating, stating, "Blvcklvnd Rvdix 66.6 (1991) is a mess of Three 6 Mafia-chanting, woozy Wu-Tang loops, DJ Screw wheeze, and Mortal Kombat and Godzilla sound effects, all paired with an off-the-dome rapping style that's equal parts Lil Wayne and Lil B."
The Miami New Times recognized Blackland Radio 66.6 in its Miami's Ten Best Local Albums, EPs, and Mixtapes of 2011 article, with an in-depth review noting "The Carol City boy takes his raw rap style to the next dimension with touches of horrorcore, dabbling songs with a feminine screech and a Vincent Price-like laugh. He even gets barebones experimental, leaving hardly a beat on his track Get Yah Head Bust."
Duncan C, writing for The Fader, calls the mixtape SpaceGhostPurrp's "greatest and most diverse work to date". He considers "Fuck Taylor Gang (Not a Diss We Are Just Not Dickriders)" to be a Wiz Khalifa diss track. Duncan highlighted the song "Get Yah Head" as an "instant standout".
In 2025, "Fuck Taylor Gang" was sampled by Playboi Carti on his third studio album Music and was used on the song "Crank".
All tracks are written and produced by SpaceGhostPurrp (Markese Rolle), except where noted.