Knowledge Is King is the third solo studio album by American rapper Kool Moe Dee from the Treacherous Three. It was recorded at Soundtrack Studios in New York City, New York and released on May 26, 1989 via Jive Records. Production for the album was handled by Teddy Riley, LaVaba Mallison, Pete Q. Harris and Kool Moe Dee. The record peaked at number 25 on the Billboard 200 and number 2 on the Top R&B/Hip-Hop Albums. It is his second best-selling album, achieving gold certification by the RIAA on August 22, 1989 (his previous album How Ya Like Me Nowwas certified platinum).
The album spawned four charted singles: "Let's Go", "All Night Long", "I Go to Work", and "They Want Money". "They Want Money" went the most successful single of the effort, peaking at #3 on the Hot R&B/Hip-Hop Songs, #2 on the Hot Rap Songs and #91 on the UK Singles Chart. "I Go to Work" peaked at #13 on the Hot R&B/Hip-Hop Songs and #5 on the Hot Rap Songs. "All Night Long" peaked at #70 on the Hot R&B/Hip-Hop Songs, and "Let's Go", a diss track towards Kool Moe Dee's foe LL Cool J, peaked at #11 on the Hot R&B/Hip-Hop Songs.