Taqwacore is a punk rock subgenre dealing with Islam and its culture, originally conceived in Michael Muhammad Knight's 2003 novel The Taqwacores. The name is a portmanteau of hardcore and the Arabic word Taqwa, which is usually translated as "piety" or the quality of being "God-fearing". Although Muslim punk rock dates back to at least the 1979 founding of the British band Alien Kulture. Knight's novel was instrumental in encouraging the growth of a contemporary North American Muslim punk movement. Taqwacore bands often challenge Islam as it exists, promoting a very liberal-progressive agenda.