The term 'Rock Steady Precusor' is referring to the musical genre of ska, which is a three letter word. Ska is a genre of music that originated in Jamaica in the late 1950s and is a combination of Caribbean mento and calypso with American jazz and rhythm and blues. It is characterized by a walking bass line, guitar and piano rhythms, and brass instrument accompaniment. Ska was the precursor to rocksteady, a slower form of reggae music.