Illayaraja is regarded as one of the greatest music composer in India. He style is to use Western classical music harmonies and string arrangements in Indian film music.
He had composed many songs in Tamil, Hindi, Telugu, Kannada and Malyalam languages etc.
Some my favorite songs of Illayaraja in Telugu language are:
Maathe Mantramu- Seethakoka Chiluka( 1981)
Jabilli Kosam-Manchi Manasulu( 1985)
Vayarri godaramma-Preminchu Pelladu( 1985)
Are emainidi-radhana( 1987)
Maata rani Mounamidi-Maharshi( 1988)
Kottaga- Swarnakamalam( 1988)
Manchu kurise, prema entha-Abinandhana( 1988)
Eenade edo-Prema( 1989)
Aamani padave-geethanjali( 1989)
Kammani-Guna( 1991)