The inspiration for many of Iran's hard rock songs of the 1970s was bands like Cream, The Who and above all The Jimi Hendrix Experience. With the victory of the Iranian Revolution, heavy metal and hard rock in Iran disappeared for a while. After the 1979 Revolution, Iran engaged in an eight-year war with Iraq. It was at this time that some Iranian youths, led by Farshid Arabi, were playing unauthorized heavy metal. Over time, Farshid Arabi formed a group called Silent Death and continued to operate underground. The most important source of inspiration for Farshid Arabi and his band was Black Sabbath, which later became the source of inspiration for many Iranian metal bands. By the beginning of the 1990s, heavy metal has grown in Iran and gained many fans and supporters. During this period, the works of the Grunge bands were sold underground in Iran, the works of Nirvana group being the most popular and best-selling. Many bands formed during this period in Iran such as Kahtmayan, Angband, Mordab, Arsames and Master of Persia. Heavy metal and hard rock music are illegal like many other rock styles in Iran. but in recent years some bands like Gereh received permission to play concerts in Tehran.