 By the 1950s, big bands had become the preferred format, using acoustic bass guitar, multiple electric guitars, conga drums, maracas, scraper, flute or clarinet, saxophones, and trumpet.Grand Kalle et l'African Jazz (also known as African Jazz) led by Joseph Kabasele Tshamala (Grand Kalle), and OK Jazz, later renamed TPOK Jazz ("Tout Puissant Orchestre Kinshasa", meaning "all-powerful Kinshasa band") led by Franco became the leading bands.One of the musical innovations of Franco's band was the "mi-solo" (meaning "half solo") guitarist, playing arpeggio patterns and filling a role between the lead and rhythm guitars.