Review: At ‘Summer,’ the disco ball has spun off its axis

Someone really did leave the damn cake out in the rain. That’s my metaphorical summation of “Summer: The Donna Summer Musical.” Fans will recognize the allusion, and I’ll throw in one more for good measure. As we have learned over the past couple of decades, when jukebox musicals are bad, they are so, so bad. “Summer” is a case in point. The hits are all here, performed by two gifted singing actors: LaChanze as the later-career Donna, or “Diva Donna” as she is denoted in the program, and Ariana DeBose as the earlier “Disco Donna,” when Summer’s fame was at…