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Please note that for formatting reasons only, the pre-registered protocol for this study has been uploaded in PDF form rather than using the standard OSF template. This approach allows use of subscript and tables, which are essential to convey the complex content of the protocol clearly. Care has been taken to ensure that the protocol includes all the key elements included in the OSF standard template. HIT is a large-scale longitudinal study investigating changes in auditory function over a three-year period during which many participants will commence regular attendance at high-sound-level environments (live music events and nightclubs). Over the course of 2021-22, a cohort of 220 British teenagers aged 16-17 have undergone an extensive battery of physiological, psychoacoustic, and self-report measures. In 2022-23, the cohort will reach age 18: the age of majority in the UK, at which concert-going and clubbing become commonplace. They will provide data on their noise exposure at 18-month intervals. In 2024-25, when participants are aged 19-20, the measures will be repeated. We will test for relations between the auditory change measures and intervening noise exposure, and for effects of covariates such as sex, skin tone, type of noise exposure, and lifestyle factors. Exploratory analyses will include relations between auditory measures and predictors of baseline auditory function.