Sangpuy Katatepan Mavaliyw is a Taiwanese Aboriginal pop artist of the Pinuyumayan ethnic group. His albums have been acclaimed by Aboriginal listeners and Han-Taiwanese mainstream music critics for capturing the traditional Aboriginal sound and evoking the presence of the ancestors. In this thesis, I explore why Sangpuy's songs are understood to evoke ancestral spirit imaginary using a semiotic approach. I compare his music to traditional Pinuyumayan music such as pa'ira'iraw and shamanic songs to demonstrate how he uses similar musical gestures to evoke the sense of ancestral spirits. Other sonic elements such as the inclusion of the soundscape of a Pinuyumayan village provides a direct link to the lived experiences of the Pinuyumayan. I also position Sangpuy's music in the broader context of nationalism in Taiwan and how Sangpuy uses his music to negotiate Aboriginal issues such as land rights and environmentalism. Through this analysis, I demonstrate how Taiwanese Aborigines are incorporating their Indigenous ideology into popular music to carve out a space for themselves in Taiwanese society and garner more support for Indigenous rights in Taiwan.