A version of the song "Thousand Knives" was released on the Yellow Magic Orchestra's 1981 album "BGM". This version was one of the earliest uses of the Roland TR-808 drum machine, for YMO's live performance of "1000 Knives" in 1980 and their "BGM" album release in 1981. In 1980, Sakamoto released the solo album "B-2 Unit", which has been referred to as his "edgiest" record and is known for the electronic song "Riot in Lagos", which is considered an early example of electro music (electro-funk), as Sakamoto anticipated the beats and sounds of electro. Early electro and hip hop artists, such as Afrika Bambaata and Kurtis Mantronik, were influenced by the album—especially "Riot in Lagos"—with Mantronik citing the work as a major influence on his electro hip hop group Mantronix. "Riot in Lagos" was later included in Playgroup's compilation album "Kings of Electro" (2007), alongside other significant electro compositions, such as Hashim's "Al-Naafyish" (1983). According to "Dusted Magazine", Sakamoto's use of squelching bounce sounds and mechanical beats was later incorporated in early electro and hip hop music productions, such as “Message II (Survival)” (1982), by Melle Mel and Duke Bootee; “Magic’s Wand” (1982), by Whodini and Thomas Dolby; Twilight 22's “Electric Kingdom” (1983); and Kurt Mantronik's "" (1985). The 1980 release of "Riot in Lagos" was listed by "The Guardian" in 2011 as one of the 50 key events in the history of dance music. Among other tracks on "B-2 Unit", "Differencia" has, according to "Fact", "relentless tumbling beats and a stabbing bass synth that foreshadows jungle by nearly a decade". Some tracks on the album also foreshadow genres such as IDM, broken beat, and industrial techno, and the work of producers such as Actress and Oneohtrix Point Never. For several tracks on the album, Sakamoto worked with UK reggae producer Dennis Bovell, incorporating elements of afrobeat and dub music. Also in 1980, Sakamoto released the single "War Head/Lexington Queen", an experimental synthpop and electro record, and began a long-standing collaboration with David Sylvian, when he co-wrote and performed on the Japan track "Taking Islands In Africa".