The last IR song i listened to is a very rare telugu song. It is from an obscure telugu film called "Pattudhala". And the song is "Eppudoo Oppukovaddhu Ra Otami", a song sung by Yesudas and brilliantly written by Sirivennela Seetharama Sasthry.
Ilaiyaraaja did a terrific job in this song. I think this song/film came in 1989-90-91 period. The sound of the song (guitar sound, strings sound, etc) is little closer to the ones in Nirnayam.