1950s, revues were popular; some names of the era were the comedians Povel Ramel and Kar de Mumma. The Hasse & Tage duo continued the comedic tradition in 1962 and became something of an institution in the Swedish revue world for twenty years, encompassing radio, television and film productions. With the late 1960s came a breakthrough for alternative drama of a freer nature, and theatre became more of a venue for popular tastes. In the 1970s and 1980s, the two most noted playwrights were Lars Norén (1944–) and Per Olov Enquist (1934–2020). Children's literature In the 1930s a new awareness of children's needs emerged. This manifested itself shortly after World War II, when Astrid Lindgren published Pippi Longstocking in 1945. Pippi's rebellious behaviour at first sparked resistance among some defenders of cultural values, but eventually she was accepted, and with that children's literature was freed from the obligation to promote moralism. Astrid Lindgren continued to publish many best-selling children's books which eventually made her the most read Swedish author, regardless of genre, with over 100 million copies printed throughout the world and translations into over 80 languages. In many other books Lindgren showed her fine understanding of children's thought and values; in The Brothers Lionheart about death, as well as a tale of bravery; in Mio, My Son, a fairy tale about friendship. But not all her stories had deep messages. Three books on Karlsson-on-the-Roof (1955, '62, '68) are about a short, chubby and mischievous man with a propeller on his back, who is befriended by a boy. Lindgren wrote twelve books about Emil of Maple Hills, a boy living in the Småland countryside in the early 1900s, who continuously gets intro trouble because of his pranks, yet in later life becomes a responsible and resourceful man, and the Chairman of the Municipality Council. One of few fantasy writers in Swedish literature apart from Lindgren was the Finnish writer Tove Jansson (1914–2001), who wrote, in the Swedish language, about the Moomins. The Moomins are trolls who live in an economically and politically independent state, without any materialistic concerns. The Moomins have appealed to people in many different countries and Jansson's books have been translated into over 30 languages. Crime fiction Before World War II, the Swedish detective novel was based on British and American models. After World War II, it developed in an independent direction. In the 1960s, Maj Sjöwall