We present a high-resolution, densely sampled data set of wild bird songs collected over multiple years from a single population of great tits, Parus major, in the U.K. The data set includes over 1100000 individual acoustic units from 109963 richly annotated songs, sung by more than 400 individual birds, and provides unprecedented detail on the vocal behaviour of wild birds. Here, we describe the data collection and processing procedures and provide a summary of the data. We also discuss potential research questions that can be addressed using this data set, including behavioural repeatability and stability, links between vocal performance and reproductive success, the timing of song production, syntactic organization of song production and song learning in the wild. We have made the data set and associated software tools publicly available with the aim that other researchers can benefit from this resource and use it to further our understanding of bird vocal behaviour in the wild. •We present a large data set of songs from a wild population of great tits.•It contains 1.1M acoustic units from 109K songs recorded over several years.•It includes extensive metadata and annotations.•The data set and associated software tools are publicly available.