After several weeks of public preview performances to test creative ideas, the world-premiere “Purple Rain” musical adaptation officially opened in its finished form Nov. 5.

Like the original 1984 film, the musical — which runs at the State Theatre in downtown Minneapolis through Nov. 23 before producers intend to bring it to Broadway — incorporates plenty of Prince songs.

So during the nearly two years the renowned creative team has been working on developing the musical, they’ve enlisted the help of two longtime Prince collaborators as music advisers: Bobby Z, who was the drummer in Prince’s band The Revolution between 1978 and 1986 and himself appeared in the “Purple Rain” movie; and Morris Hayes, who was a keyboard player in Prince’s subsequent band New Power Generation for about two

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