The authors describe real-world digital music exposures that reliably induce small temporary threshold shift in normal hearing human subjects. Effects of digital audio player use on hearing sensitivity were measured in 33 subjects that listened to rock or pop music playlists for four hours at ~94 (n=10), ~99 (n=11), or ~100 (n=12) dB-A in-ear level. Temporary threshold shift was greatest at 4 kHz. The authors describe variability of temporary threshold shift induced by music player use in this healthy, normal-hearing, young adult population, and demonstrate complete recovery. The authors propose the protocol as appropriate for evaluation of interventions of otoprotection potential, with the requirement that subjects be fully informed of potential risks.