How many movies have A.R. Rahman and M. Rathnakumar collaborated on?

They have worked on 3 movies together! Their first movie together was Kizhakku Cheemayile (1993) while their highest rated movie together was Ah Aah: Anbe Aaruyire (2005). They have not worked together since Ah Aah: Anbe Aaruyire (2005). They are most known for their drama films together.