Extended reality (XR) technology challenges practitioners to update the method of representation in art, which our laboratory has been working on as well [2]. Thus, in this demonstration, we present Air Maestros (AM), a multi-user audiovisual experience in mixed reality (MR) space using Microso" HoloLens. The purpose of AM is to expand an ordinary music sequencer method into a three-dimensional (3D) space and a multi-user system. In this case, the users place 3D note objects into the MR space and, with a certain gesture, shoot a glowing ball at them. When their shots hit the 3D note objects, audiovisual effects appear at the objects' spatial positions.