A cool video has emerged from China of a teacher playing a bizarre "combinational" musical instrument he invented.<br /><br />The footage, shot in Guangyuan, Sichuan Province on April 26, shows the teacher named Wang playing different instruments at the same time in his class. <br /><br />The invention combines drums, Erhu (Chinese string instrument) and Chinese xylophone which the teacher can play thanks to sticks fixed on his hat.