Headphones; telecommunications apparatus; record players; needles for record players; speed regulators for record players; styli for record players; tone arms for record players; apparatus for changing record player needles; equalizers [audio apparatus]; audio switching apparatus; audio equipment; audio interfaces; audio mixers; portable audio players; measuring devices, electric; transformers [electricity]; detectors; conductors, electric; cables, electric; smartphones; computers; computer hardware; tablet computers; wearable computers; computer programs, downloadable; metronomes; electric and electronic effects units for musical instruments; phonograph records; downloadable music files.