The best replacement for hariharan is tari khan.

The best alternatives to hariharan are rated as following:
★★★★★  tari khan
★★★★★  spb

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Speaking about hariharan, one probably shouldn't forget about zakir hussain.

Other search terms related to hariharan and their ratings are:
★★★★★ zakir hussain
★★★★ shankar mahadevan
★★★ tari khan
★★ yesudas
★ pragathi
★ ar rahman
★ aajith
★ zakir
★ sai baba
★ chitra
tari
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hariharan
tari khan
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