The term 'Blues Alternative' is a type of music that combines elements of blues and SOUL. The crossword solution for this term is SOUL, which is a 4-letter word. SOUL music is a genre of popular music that originated in the United States in the 1950s and 1960s. It combines elements of gospel, rhythm and blues, and jazz. SOUL music has been influential in many other genres of music, including funk, rock, and hip hop.