Twelfth Night is a British progressive rock band that emerged in the late 1970s, known for blending elements of neo-progressive rock with theatrical and atmospheric compositions. They were part of the wave of bands that helped revive interest in progressive rock during the early 1980s, developing a distinctive sound that incorporated both complex instrumentation and accessible song structures. Their music often explores introspective and conceptual themes, contributing to the foundation of the neo-prog movement alongside other key acts of the era.