Normally a banjo has five strings. In the 1920s, instruments such as the ukulele banjo, guitar banjo and banjo mandolin were developed which
The four-stringed banjo ukulele, also known as banjulele or banjuke, combined a banjo body with an ukulele fretboard and an ukulele tuning. The advantage was the higher volume compared to a simple ukulele, which was further enhanced in the version as resonator. It was particularly popular for the performance of jazz music.