Dirty blues encompasses forms of blues music that deal with socially taboo subjects, including sexual acts and/or references to drug use of some kind. Due to the sometimes graphic subject matter, such music was often banned from radio and only available on a jukebox. The style was most popular in the years before World War II, although it had a revival in the 1960s. The more noteworthy musicians who utilised the style included Bo Carter, Bull Moose Jackson, Harlem Hamfats, Wynonie Harris, and Hank Ballard and The Midnighters.