data processing apparatus; computers; computer peripheral devices; Computer monitors; tablet computers; smartwatches; smartglasses; interactive touch screen terminals; electronic interactive whiteboards; loudspeakers; cabinets for loudspeakers; microphones; electric door bells; locks, electric; Alarm installations and alarms; Electronic notice boards; Television sets; sound recording apparatus; laptop computers; mobile telephones; camcorders; audio- and video-receivers; sound reproduction apparatus; sound transmitting apparatus; virtual reality headsets; television cameras; Downloadable computer software for manipulating digital audio information for use in audio media applications; Downloadable computer operating programs; headsets; Electric and electronic video surveillance installations; cameras; Visual and audio recordings featuring lessons in the field of music; video screens; Light emitting diode (LED) displays; Sound bars