The crossword solution for the term 'Beatles' Adjective' is FAB, which is an acronym for 'Fantastic And Brilliant'. The Beatles were a British rock band formed in Liverpool in 1960, and are widely regarded as one of the most influential bands of all time. They achieved international fame with their songs, which combined elements of pop, rock, and psychedelia. The term FAB is often used to describe the band's music, as well as their style and influence.