Downloadable mobile phone software applications; computer programs, recorded; smartglasses; smartwatches; smartphones; wearable activity trackers; tablet computers; notebook computers; downloadable music files; downloadable image files; electronic sheet music, downloadable; interactive touch screen terminals; smart rings; fingerprint identifier; human face recognition devices; electric and electronic effects units for musical instruments; audio interfaces; equalizers (audio apparatus); subwoofers; virtual reality headsets; audio mixers; earphones; computer programs for editing images, sound and videos; software for processing images, graphs and words; software for music composition; computer software for processing digital music files; central processing units (processors) for processing information, data, sound and images; software for controlling and improving sound quality of audio apparatus; computer software for operating and controlling audio and video apparatus; vibration absorber for electronic audio apparatus; digital sound processors.