This was a dizzying night of "American Idol," with wild highs and lows. A few comments and then a prediction:
1) A high: Randy Jackson used to tell people not to sing Whitney Houston, Celine Dion or Mariah Carey. Now Hollie Cavanagh has conquered two of them on consecutive weeks -- first Houston (she had no choice) and now Dion.
2) Higher: Still, in raw difficulty, nothing matches "When a Man Loves a Woman." Joshua Ledet conquered it beautifully.