["Psychophysiology, Volume 63, Issue 8, August 2026. ", "\nABSTRACT\nFamiliarity judgments are thought to involve evidence accumulation, a decision‐making process in which information is gathered over time until a threshold is reached. Previous work has identified a scalp‐recorded signature of evidence accumulation called the central‐parietal positivity (CPP). We built on this previous work and recorded electroencephalography while participants listened to several melodies, instructing participants to respond as soon as the song felt familiar. A prominent CPP was noted, time‐locked to decisions. We then used linear regression to unmix overlapping neural responses and observed a stimulus‐locked indicator of evidence accumulation that increased in amplitude just prior to a familiarity decision. This result suggests that song familiarity relies on evidence accumulation, with individual notes in a familiar song acting as “evidence”.\n"]