We have many instruments, just because you only know of one does not mean we only have one. If we are talking about funeral then we have the qeej and the drum. For courtship we have a multitude of flutes and the mouth harp. For entertainment we have the "xis xau." For war we have the qeej and the drum again and the bull horn flute. The Hmongs in China has come up with many version of the qeej that can play at many different notes, low and high. So if you take a close look you'll know that we have tons of instrument.