I was recently visiting churches in the refugee camps of northwestern Uganda and came across these wonderful instruments. Called an adungu (or ekidongo or ennenga in other languages) it is a sort of arched harp.
When arriving at one church, I heard music coming from inside. The bass was so clear that I assumed it was a speaker system. I looked around and saw no power lines at all and was curious how they were powering the audio system. Upon entering the church I saw three men playing adungus of different sizes. The largest (which was making the deep, clear bass tones) was so long that a little kid sat on the tail end and beat it like a drum!