《piradinha》。 The background music played in the back room of Mamou in Tik Tok is called piradinha, and the most background music is the theme song sung by Phoenix Legend, Tik Tok, which is a short video social software with musical creativity hatched by ByteDance. The software was launched on September 2, 216. It is a short video community platform for all ages. Users can choose songs and shoot music works to form their own works through this software.