Following World War II, Nigerian music started to take on new instruments and techniques, including electric instruments imported from the United States and Europe. Rock N' roll, soul, and later funk, became very popular in Nigeria, and elements of these genres were added to jùjú by artists such as IK Dairo. Meanwhile, highlife had been slowly gaining in popularity among the Igbo people, and their unique style soon found a national audience. At the same time, apala's Haruna Ishola was becoming one of the country's biggest stars. In the early to mid-1970s, three of the biggest names in Nigerian music history were at their peak: Fela Kuti, Ebenezer Obey and King Sunny Adé, while the end of that decade saw the start of Yo-pop and Nigerian reggae.