This dissertation explores a number of important issues that have not been addressed in prior writing on HJDB, and consists of three main objectives. The first is to provide a written history of the genres from the perspective of those that have made the music. This history catalogues the origins of the United Kingdom's DJ-oriented electronic music genres, the incorporation of breakbeats into this music that created the Hardcore genre, and developments that then resulted in the creation of the Jungle genre and subsequently the Drum & Bass genre. The second objective is to provide an explanation of the main technologies used in the creation of this music (e.g., the digital sampler) and the techniques developed by musicians to harness this technology. The third objective is to provide methods for the computational analysis of HJDB music, through automated determination of the breakbeats being used, detection of downbeat locations, and an estimation of the degree of rhythmic modification. Each of these objectives has been informed by over twenty interviews with musicians and label owners from throughout the history of HJDB.