The potential for the systematic analysis of YouTube comments has been recognised by many researchers in fields including music information retrieval (MIR), sociology, and musical ethnography (Yadati et al. 2014; Thelwall 2018; Born and Haworth 2017). Notably, since 2008 YouTube has automatically detects timecodes in user-generated comments, converting them to “deep” links that skip playback directly to the moment in the video cited (Vliegendhart et al. 2015). Presenting the history, use, and future prospects of these time-coded comments (TCCs) on YouTube, I assess their value as a novel primary source for digital musicologists.