Hip-Hop recording artist LL Cool J performs in a music video for the 1989 single "The Boomin' System" from his 1990 album "Mama Said Knock You Out".Hip-Hop recording artist LL Cool J performs in a music video for the 1989 single "The Boomin' System" from his 1990 album "Mama Said Knock You Out".Hip-Hop recording artist LL Cool J performs in a music video for the 1989 single "The Boomin' System" from his 1990 album "Mama Said Knock You Out".