and jùjú were at the top of the Nigerian charts in the '60s, traditional music remained widespread. Traditional stars included the Hausa Dan Maraya, who was so well known that he was brought to the battlefield during the 1967 Nigerian Civil War to lift the morale of the federal troops. Modernisation of Jùjú Following World War II, Tunde Nightingale's s'o wa mbe style made him one of the first jùjú stars, and he introduced more Westernised pop influences to the genre. During the 1950s, recording technology grew more advanced, and the gangan talking drum, electric guitar and accordion were incorporated into jùjú. Much of this innovation was the work of IK Dairo & the Morning Star Orchestra (later IK Dairo & the Blue Spots), which formed in 1957. these performers brought jùjú from the rural poor to the urban cities of Nigeria and beyond. Dairo became perhaps the biggest star of African music by the '60s, recording numerous hit songs that spread his fame to as far away as Japan. In 1963, he became the only African musician ever honoured by receiving membership of the Order of the British Empire, an order of chivalry in the United Kingdom. Dispersion of highlife Among the Igbo people, Ghanaian highlife became popular in the early 1950s, and other guitar-band styles from Cameroon and Zaire soon followed. The Ghanaian E. T. Mensah, easily the most popular highlife performer of the 1950s, toured Igbo-land frequently, drawing huge crowds of devoted fans. Bobby Benson & His Combo was the first Nigerian highlife band to find audiences across the country. Benson was followed by Jim Lawson & the Mayor's Dance Band, who achieved national fame in the mid-'70s, ending with Lawson's death in 1971. During the same period, other highlife performers were reaching their peak. These included Prince Nico Mbarga and his band Rocafil Jazz, whose "Sweet Mother" was a pan-African hit that sold more than 13 million copies, more than any other African single of any kind. Mbarga used English lyrics in a style that he dubbed panko, which incorporated "sophisticated rumba guitar-phrasing into the highlife idiom". After the civil war in the 1960s, Igbo musicians were forced out of Lagos and returned to their homeland. The result was that highlife ceased to be a major part of mainstream Nigerian music, and was thought of as being something purely associated with the Igbos of the east.