It is fascinating that a musical career as storied and diverse as Prince’s should be defined by one period. Through five different decades, the late Minneapolis-born funk-rocker tossed off effortless pop gems, belabored triple albums, online-only oddities and even a deeply strange record about Batman. His Spotify stats tell a different story: a brief but intense period of game-changing mid-‘80s pop and R&B, culminating with 1984’s Purple Rain, the hits-packed soundtrack to his ascension to superstar status, both onstage and on film.

His best film work, though, was less seen than either Purple Rain or even its bomb of a follow-up, the 1986 black-and-white screwball comedy Under the Cherry Moon. For years difficult if not impossible to find, the 1987 concert feature Sign O’ the Times is an exhilarating 84 minutes of Prince’s unabated genius.

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