A Wrinkle in Time’s script explicitly justifies the decision to adapt the novel into this new musical. 

Throughout the show, characters repeatedly bemoan the simplistic inability of human language to capture the intricate mysteries of the universe, which transcend the bounds of our linguistic expression and cognition. 

Whereas text — words, words, words! — are the primary vehicle of literature, a musical adds both sight and, crucially, sound to the equation; a bedrock adage of musicals is that characters burst into song whenever mere speech falls short of being able to convey the depths of their condition. 

Which is a very Wrinkle in Time notion. 

And Heather Christian’s score comes closest to probing this indescribable magic.