"King" was about the late Martin Luther King, Jr., questioning the lost direction of the deceased leader's followers and the state of mourning of a nation after his death, Taken from the Album Signing Off.
Signing Off featured a mix of reggae and dub material which was lyrically politically charged and socially conscious, while musically it was reverb-heavy, doom-laden yet mellifluous, best exemplified in the hits "King" and "Food For Thought"
The album's release was preceded by two double A-sided singles. The first, "King"/"Food For Thought", was released as UB40's debut single in February 1980. It topped the independent music chart for three months, reached number 4 in the main UK singles chart, and went on to sell nearly half a million copies.
speaking about the single in 2010, Bob Lamb said, "'Food for Thought' was actually the B-side of 'King' originally: although it was a double A-side 'King' was always going to be the main song, but the DJs picked up on 'Food for Thought' because it was quicker and chirpier, more dancey, more of a radio track.
Apart from loving this track the main reason I have done this video is as practice at using Davinci Resolve.
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Above text is from Wikipedia