Sound at a rock concert was analysed by computer. In three dimensional display, chronological change of band pass data could be observed at a glance. In Level/Time display, level change in each frequency could be observed successively. We found those frequencies which showed small level change and those frequencies which showed large level change. In L5, L10, L50, L90, L95, and Leq display, L50 values agreed to leq values. Computer analysis of sound at a rock concert will be useful in understanding the characteristics of rock music which may induce auditory damage.
