Atomic music segments are visually and sonically rendered within a browser window as directed by a set of interface controls thus providing the ability to directly control various performance parameters while also communicating the intentions of the composer and arranger in a manner similar to traditional sheet music. In certain embodiments, individual voices may be selectively displayed, muted, or attenuated in order to focus a practice session or performance on particular parts. In one embodiment, atomic music segments and their associated lyrics are sequentially highlighted as the music progresses, providing a convenient means for reviewing or practicing music. Each atomic music segment may include one or more notes that have a substantially common onset time, thus providing an essentially indivisible unit of music convenient for user interaction and control.