Like the Alice Walker novel on which it is based, the musical version of “The Color Purple’’ is at once epic and personal - packed to bursting with incident and character, spanning 40 years, yet seen through the eyes of one downtrodden woman who only finds her own power late in the day. Also like the novel, it can seem exhaustingly meandering, but it also has an essential goodness at its core.
These inherited traits are at once the strength and the weakness of the musical, whose book writer, Marsha Norman, has stayed closer to the novel than did Steven Spielberg’s movie version. And the musical, now at the Citi Wang Theatre, has something that neither book nor movie did: It has a rich variety of songs, written by the new-to-theater team of Brenda Russell, Allee Willis, and Stephen Bray, that combine a whole range of idioms into a lively and often uplifting new form.