references

Some indication of how widespread hearing damage might be:

Wilson, D. H., Walsh, P.G., Sanchez, L., Davis, A.C., Taylor, A.W., Tucker, G., & Meagher, I. (1999). The epidemiology of hearing impairment in an Australian population. International Journal of Epidemiology, 28, 247-252.

A possible cause of exposure induced loss

Vogel, I., Brug, J., van der Ploeg, C.P.B., & Raat, H. (2007). Young people’s exposure to loud music: A summary of the literature. American Journal of Preventative Medicine, 33(2), 124-133.