Digital interfaces for computers for audio recording; amplifiers; keyboard amplifiers; signal converters; sound equalizers and crossovers; stereo receivers; transceivers; microphones; electric sound mixing apparatus, namely, mixing consoles; software for audio editing, recording and production; audio cables; recording media for audio signals, namely, blank digital storage media for recording audio signals; headphones and headphone amplifiers; audio speakers; computer monitors for audio studio use; guitar microphones and amplifiers; downloadable electronic publications in the nature of manuals in the field of sound recording production; downloadable electronic publications, namely, magazines in the field of audio production; digital music downloadable from the Internet