geoffrey gurrumul yunupingu (22 january 1971 – 25 july 2017), often known simply as gurrumul, was an indigenous australian musician. he was best known as a singer. most of his songs are sung in galpu, gumatj or djambarrpuyngu, which are all languages of the yolngu people of northeastern arnhem land. he plays the guitar, drums, keyboards and "yidaki" (didgeridoo).