Sonic Visualiser is a free and open-source software application compatible with Windows, Linux, and Mac, serving as an essential tool for anyone interested in performing an in-depth analysis of music recordings. Its user-friendly interface caters to a variety of professionals, including musicologists, archivists, and researchers in signal processing, all seeking to explore the intricate details within audio files. As a versatile program, Sonic Visualiser offers extensive capabilities for the visualization, analysis, and annotation of audio recordings, making it one of the most adaptable tools available. It allows for quick comparisons of various audio files that share the same source material, such as different performances of a piece or alternative takes of an instrumental segment. Additionally, it provides high-quality transcription of pitch and notes, particularly beneficial for scientific research focusing on solo vocal recordings. For those needing to process audio data in bulk, Sonic Visualiser also features a non-interactive command-line tool for batch extraction of audio features, ensuring a comprehensive suite of functions for diverse audio analysis needs.