The term 'King of Rock 'n' Roll' is often used to refer to the iconic singer and actor Elvis Presley. The five-letter crossword solution for this term is ELVIS. Elvis was a hugely influential figure in the music industry, and his style of rock and roll revolutionized popular music in the 1950s and 1960s. He is widely considered to be one of the most important figures in 20th century music and culture.