 In those songs, 2,500 songs were sung by singers S. P. Balasubrahmanyam and K. S. Chithra.The Raj-Koti duo was among the many prominent South Indian composers for whom A. R. Rahman has worked as a keyboard programmer for 8 years.In a television interview aired on ABN Andhrajyothy, the duo announced that they are teaming up again in 2012 and reinstate the Raj-Koti brand.