The term 'POP-MUSIC CATEGORY' can be summarized by the crossword solution 'SOUL, ' which is a four-letter word. SOUL music is a popular genre of music that originated in the United States in the 1950s and 1960s. It combines elements of African-American gospel music, rhythm and blues, and jazz. SOUL music typically features passionate vocals, strong rhythms, and often a call-and-response between the lead vocalist and the chorus. It is known for its emotive lyrics and its ability to evoke strong emotions in listeners.