The best replacement for ayu is enji.

The best alternatives to ayu are rated as following:
★★★★★  enji
★★  public gold
★★  mustika ratu
★  utada
★  gita gutawa
  jolin

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Speaking about ayu, one probably shouldn't forget about david foster.

Other search terms related to ayu and their ratings are:
★★★★★ david foster
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ayu
enji
public gold