Indian movie lovers: Why did director Mani Ratnam split with Illayaraja?

Maestro Illayaraja composed wonderful music for Director Mani Ratnam's movies like : Pagal nilavu, Idhaya Kovil, Mouna Ragam, Nayagan, Agni Natchathiram, Geetanjali (Telugu - Idhayathai Thirudathae in Tamil), Anjali and Thalapathi. Why did they stopped working together and Mani Ratnam... show more Maestro Illayaraja composed wonderful music for Director Mani Ratnam's movies like :

Pagal nilavu,
Idhaya Kovil,
Mouna Ragam,
Nayagan,
Agni Natchathiram,
Geetanjali (Telugu - Idhayathai Thirudathae in Tamil),
Anjali and
Thalapathi.

Why did they stopped working together and Mani Ratnam choose AR Rahman over Illayaraja? AR Rahman composes wonderful music too! But what is the real reason behind their split?
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